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Ergotron – LX Vertical Stacking Dual Monitor Arm, VESA Desk Mount – for 2 Monitors Up to 40 Inches, 7 to 22 lbs Each – Tall Pole, White

Ergotron – LX Vertical Stacking Dual Monitor Arm, VESA Desk Mount – for 2 Monitors Up to 40 Inches, 7 to 22 lbs Each – Tall Pole, White

Bottom line: The Ergotron – LX Vertical Stacking Dual Monitor Arm, VESA Desk Mount –: Handles two displays up to 40 inches and 22 lbs each; main trade-off: per-arm load floor is 7 lbs, so very light panels may drift.

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By , Founder & Editor-in-Chief · Listing data updated

Mike Perry — Hardware researcher since 2014, focused on GPU performance across gaming, rendering, and local-LLM inference. Synthesises community benchmarks, manufacturer specs, and public forum data into actionable buying guides.

Pros & Cons

Pros

  • ✓ Handles two displays up to 40 inches and 22 lbs each
  • ✓ 23-inch pole plus 13 inches of lift reaches 31.7 inches above desk
  • ✓ 360-degree rotation and 75-degree tilt for portrait or landscape
  • ✓ Clamp and grommet mounts both included in the box
  • ✓ Backed by a 10-year Ergotron warranty

Cons

  • ✗ Per-arm load floor is 7 lbs, so very light panels may drift
  • ✗ Expands to 3-4 screens only with extra kit 98-130-216
  • ✗ Desk edge must measure 0.63 to 2.6 inches thick to clamp
  • ✗ Tall stacked setup demands real vertical clearance above the desk

Manufacturer description

The Ergotron LX Vertical Stacking Dual Monitor Arm turns a single desk into a two-screen workstation without the wobble of a stock stand. Its 23-inch tall pole carries two independent LX arms, each rated for a display up to 40 inches and 7 to 22 pounds, so you can stack one monitor above the other or swing both out side by side as the task changes. VESA 75x75mm and 100x100mm patterns cover most panels, and the included two-piece clamp fits desk edges 0.63 to 2.6 inches thick, with a grommet plate in the box if you would rather route through a desktop hole. You get 13 inches of lift, up to…

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SpecPicks Verdict

SpecPicks scored Ergotron – LX Vertical Stacking Dual Monitor Arm, VESA Desk Mount… using a rating × review-volume × price-fit model applied to published specs and reviews across the home & kitchen category. Compare with similarly-priced alternatives in the home & kitchen category before committing. Judge it on the specification table and the price rather than on sentiment: check the figures that decide your use case, then put it side-by-side with two or three close alternatives in the Compare tool before clicking through.

Common buyer scenarios for home & kitchen of this kind: matching it to an existing build, replacing a failing part, or upgrading from a previous-generation equivalent. Check the spec table below against your current setup — particularly socket / form-factor / power-rating fields — and confirm compatibility on the retailer's listing before purchase. Prices and stock are set by the retailer and may have moved since this page was last updated.

Frequently Asked Questions

Will this fit my 34-inch ultrawide monitors?

Yes, each arm supports screens up to 40 inches diagonal, provided the panel weighs between 7 and 22 pounds and uses a 75x75mm or 100x100mm VESA pattern.

Can I mount the monitors side by side instead of stacked?

Yes. The two LX arms can stack one screen over the other or be positioned to either side of the pole, so you are not locked into a vertical layout.

Does it clamp to my desk or do I need to drill a hole?

Either works. The heavy-duty two-piece clamp fits desk edges 0.63 to 2.6 inches thick, and a grommet mount plate plus hardware is included for installation through a desktop hole.

How high do the monitors sit above the desk?

The arms offer 13 inches of lift and rise up to 31.7 inches from the desktop on the included 23-inch pole, with 360 degrees of rotation and 75 degrees of tilt.

Can I add a third or fourth monitor later?

Yes, by adding the LX Arm, Extension and Collar Kit accessory (part 98-130-216), which is sold separately from this two-arm package.

Key Features

  • Broad compatibility: Fits two screens up to 40 inches and 7 to 22 pounds each; compatible with VESA patterns 75x75mm and 100x100mm
  • Everything you need: Includes two LX arms and extensions, 23-inch pole, heavy duty two-piece desk clamp for surface edges 0.63 to 2.6 inches thick, grommet mount plate and hardware for installation through a desktop hole, two pole collars, two caps and mounting hardware
  • Comfortable workspace: Find your best view for each project with 13 inches of lift, rising 31.7 inches from the desktop; customize how you work or collaborate at your workstation with 360 degrees of rotation and 75 degrees of tilt
  • Flexible working: Easily stack screens one over the other or position to either side; up your screen count and productivity with three or four displays using the LX Arm, Extension and Collar Kit accessory (98-130-216); free up more of your worksurface with thoughtful cable management
  • Built to last: Extensive quality testing ensures your display stays stable and secure; Ergotron products set the standard for quality with a 10-year warranty and expert technical support

Full Specifications

BrandErgotron
ColorWhite
MaterialMetal
Unit Count1 Count
Model Number45-509-216
Mounting TypeTabletop Mount
Movement TypeArticulating
Built-In Media2 x LX Arms and Extensions
Item Type NameDesk Mount
Mfr Part Number45-509-216
Number of Items1
Number of Packs1
Compatible DevicesMonitor
Enclosure MaterialMetal
Maximum Tilt Angle75 degrees
Broad compatibilityFits two screens up to 40 inches and 7 to 22 pounds each; compatible with VESA patterns 75x75mm and 100x100mm
Warranty Description10 Year
Maximum-Supported Screen Size40 inches
Minimum-Supported Screen Size40 inches
Global Trade Identification Number00698833061581

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Ergotron – LX Vertical Stacking Dual Monitor Arm, VESA Desk Mount – for 2 Monitors Up to 40 Inches, 7 to 22 lbs Each – Tall Pole, White is listed on Amazon. Price, availability, shipping and returns are set by Amazon and its sellers — check the listing for current terms. SpecPicks earns a small commission on qualifying purchases — thank you for supporting independent review work.

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Ergotron – LX Vertical Stacking Dual Monitor Arm, VESA Desk Mount – for 2 Monitors Up to 40 Inches, 7 to 22 lbs Each – Tall Pole, White
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