Could this be clamped on a bar above my work space and used in a sort of upside down manner? There is no nearby wall or desk.

It has to be in it's upright position. The way it's build weight (from above) keeps it in place. If you try to mount it upside down it won't work.

What diameter does the pole/pipe/mount need to be to fit or work with this extension arm?

For this arm it is 1.38" (35mm). It is not compatible with the LX HD mount which has a 1.57" (40mm) pole

Will this work with the LX Dual Stacking Arm in order to have a longer arm at the top height?

The top arm is of fixed length and is non adjustable except for up-down tension. The extension allows the unit to expand the length from the wall bracket to the device. The device is raised in height by the height of the extension somewhere round six inches. Only two extensions can be used (raising height 12 inches aprox) and bracket on wall can be mounted lower or higher to set the device to be at the desired level. Excellent quality and durable product, mine is used with a laptop that folds away on the wall when not in use.

Lx Extension Bright White Wall

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Description

🖥️ Elevate your setup—because your workspace deserves the best extension!

BRIGHT WHITE FINISH - Clean, professional look that blends seamlessly with your workspace.
ENGINEERED FOR FLEXIBILITY - Additional articulation point adapts to your dynamic work style.
EXTEND YOUR WORKSPACE FREEDOM - Unlock new angles and positions with a 9-inch extension arm.
SLEEK DURABLE ALUMINUM BUILD - Lightweight yet robust design complements any modern office.
INSTALL IN MINUTES WORK FOR HOURS - Effortless setup means less downtime, more productivity.

The Ergotron LX Extension Bright White Wall is a lightweight, 9-inch aluminum arm designed to add an extra articulation point to your existing LX mount. It offers quick installation and enhances flexibility, allowing professionals to customize their workspace ergonomics with ease and style.

Specifications

ASIN	B09HTZVK4F
Brand	Ergotron
Color	White
Customer Reviews	4.7 4.7 out of 5 stars (55)
Date First Available	26 May 2022
Item Weight	204 g
Manufacturer	ERGOTRON
Manufacturer Part Number	45-289-216
Material Type	Aluminum
Model number	45-289-216
Number of Items	1
Product Dimensions	33.66 x 12.07 x 6.35 cm; 204 g

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