Should a keyboard tray be flat or tilted?

Question

Accepted Answer

Negative tilt (front edge slightly higher than back) is ergonomically ideal — it keeps wrists straight or slightly downward, reducing carpal tunnel pressure. Flat is acceptable. Positive tilt (front edge lower) is the worst as it forces wrist extension. The Humanscale 6G allows negative tilt; most budget trays are flat only.

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