Please note that you need to choose the variant of add-ons for Q3 Max first, and then add to cart.
Palm Rest
Keychron Keyboard Wooden Palm Rest
Keychron Silicone Palm Rest
Keycaps for ISO (EU) layout
These keycap sets have the variant for Q3 Max ISO, and they all have additional keycaps for Windows and macOS. The Q3 ISO keycap set is compatible with Q3 Max ISO.