This is a remix of the brilliant GoPro mount for Armattan Chameleon by Uforic (https://www.thingiverse.com/thing:3191692). I've added a mount to fit the Friday FPV Slate RS frame at 30 degrees, and added some extra touch screen protection to the mount so batteries don't smash your screen.
I'm using it printed in TPU with 50% infill and 0.2mm layer height. Comes in at 45g with the boot, so it's not light, but should save your expensive hero7. You can use the safety or moon boot from the original thing, or fly without a boot and just use tempered glass.