This is a pair of brackets for mounting a tablet on the Novation Launchpad X.

It's designed with the Microsoft Surface Go in mind, but would also fit the 2018 iPad pro 11" if I'm reading the specs right.

The brackets should slip onto the launchpad pretty tight - you may want to print at a slight scale increase if you find that it pinches too tightly. I printed in PETG which is more workable.

Edit: I've also added a revised version of the right-hand bracket to include a cutout where the charger goes, that way you can have the tablet mounted to LPX and charge it at the same time.