Value comes at at cost. The KT1 from Uncaged Ergonomics delivers the most important traits of an ergonomic keyboard tray (-15° of adjustable tilt and above average stability), but fails in several other regards. Notable problems are a lackluster mouse platform, an under-tray connector which bumps into your knee, and a short 90 day warranty.
iMovR Trackless Under-Desk Keyboard Tray Review
iMovR's Trackless Keyboard Tray is an all-around solid option for an ergonomic keyboard tray, featuring 15 degrees of negative tilt and an optional independently adjustable mouse platform. While it may not be the best option for treadmill desking, non-treadmill desk users will find that the Trackless Keyboard Tray feels much better to type on that other under-desk options.