SLIM WRIST REST PAD COMPARISON for Logitech G915 or Low-Profile Keyboard: Grifiti Slim, MX Palm Rest - YouTube
Endi on Twitter: "Perfect home made wrist rest for Logitech G815/915 :) Get 450x400x2mm mouse pad, cut it in 5 pieces, sew/glue it and done. Can try with the thicker 4mm pads.
Logitech MX Palm Rest - Keyboard Wrist Rest & Support