An ergonomic keyboard tray is any keyboard tray that corrects two problems caused by placing your keyboard directly on your desk. The first is height—without a keyboard tray, most desktops are too high for strain-free typing, causing you to engage muscles that should be more relaxed. Just about any under-desk keyboard tray will alleviate this issue. The second problem is tilt. For your wrists to be properly aligned, your keyboard should be able to achieve a negative tilt of around 15° when seated, up to 30° when standing, and potentially more if working at a treadmill desk.
Ergonomic keyboard trays overcome the innate inadequacy of desks, [...]