Tray for Apple iPad Pro 12,9"

I was experimenting with using my iPad as a secondary display for my MacBook Pro 16". My idea was to place the iPad directly over the MacBook's keyboard. To prevent the iPad from rocking on its camera bump and to keep it from accidentally pressing any keys, I designed this simple tray model.

Note: This is designed specifically for the 16" MacBook Pro and the 12.9" iPad Pro. I have not tested it with other device configurations.