Ergotron LX Vertical Stacking Dual Monitor Arm, VESA Desk Mount – for 2 Monitors Up to 40 Inches, 7 to 22 lbs Each – Tall Pole…
Best for
Best stacked / over-under
Amazon rating
Amazon aggregate, one input among many in the Verdict Score
Based on 1 trusted source
Current price
$470.00
Updated May 18, 2026 · 1 min read
Sources behind this verdict
10 reviewers weighted by source trust
The consensus
What reviewers found
Synthesized across the trust-weighted source mix below.
Across the reviewers we read, the LX Vertical Stacking variant is the consensus pick when you specifically want one monitor above another rather than side-by-side. A r/StandingDesks (high-trust) commenter describes running the LX Dual Stacking long-term and adding a third arm later, and r/Ergotron users discussing the broader LX line praise the tilt range for stacked configurations on work and gaming setups. r/ultrawidemasterrace threads on stacking specifically point to this arm as one of the few mainstream options for the configuration.
What reviewers liked
- Purpose-built tall-pole design for over-under stacking, a configuration with few quality alternatives
- r/StandingDesks (high trust) and r/Ergotron threads endorse long-term build quality
- Supports up to 40 inch monitors at 7–22 lbs each, covering most 27–32 inch panels
- Amazon 4.6/5 across 1,535 reviews indicates broad buyer satisfaction
Where it falls short
- Stacking-only configuration is less versatile than a side-by-side arm
- Premium pricing draws explicit criticism in a r/StandingDesk thread
- Lower per-arm weight floor (7 lbs) means very light monitors may not stay tilted as intended
- Specialized use case; overkill for users who only need a basic dual-monitor setup
Across the reviewers we read, the LX Vertical Stacking variant is the consensus pick when you specifically want one monitor above another rather than side-by-side. A r/StandingDesks (high-trust) commenter describes running the LX Dual Stacking long-term and adding a third arm later, and r/Ergotron users discussing the broader LX line praise the tilt range for stacked configurations on work and gaming setups. r/ultrawidemasterrace threads on stacking specifically point to this arm as one of the few mainstream options for the configuration.
The trade-off reviewers raise: stacking arms are inherently more specialized, and the tall-pole design means the upper monitor's effective height ceiling is constrained by the pole length. A r/StandingDesk thread also pushes back on Ergotron pricing across the line. But for the over-under use case, the consensus across specialist communities is that the alternatives are thin and the LX Vertical Stacking is the safe pick.
- 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 (98-130-224); 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
I am amazed that no one ever made such a thing. No one ever needed it? The simplest idea would be 2 VESA connectors angled with some buffer in between.
I opted for the mount from Monoprice because it supported higher weights and larger monitors vs the ones you find on Amazon, yet it wasn't price ...
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“Why I got a Dual Monitor Stacking Arm from Ergotron” · #UGC
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