Buyer rule
Start with the body-to-desk fit
Start with keyboard width, mouse reach, wrist position, desk edge, chair arm height, monitor position, and whether a compact keyboard or tray would reduce reach.

Keyboard and mouse ergonomics
The keyboard and mouse decide where the shoulders, arms, and chair end up during the session. GPU desks with large monitors and wide mousepads should still keep the most-used input devices close and easy to reposition.
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Buyer rule
Start with keyboard width, mouse reach, wrist position, desk edge, chair arm height, monitor position, and whether a compact keyboard or tray would reduce reach.
Risk
The common mistake is building the desk around a huge keyboard and mousepad while pushing the mouse too far away for everyday work.
Amazon ergonomics and desk lanes
Use these lanes after the chair height, monitor position, desk depth, keyboard reach, mouse path, lighting, cable slack, and tower location are specific. Amazon has the live listing details, seller terms, shipping, returns, and exact product specifications.
Keyboard lane for buyers comparing wrist position, shoulder width, and long typing sessions.
Reach-reduction lane for keeping the mouse closer on gaming and creator desks.
Mouse lane for buyers comparing hand position and desk-space needs.
Fixed-position lane for small desks, editing desks, and setups with limited mouse space.
Height lane when the desktop is too high for comfortable keyboard and mouse placement.
Surface lane for keeping inputs stable while avoiding hard desk edges.