These brackets are meant to mount a 15 Button Stream Deck to a mountain.gg Everest keyboard, slotting into the led bar gap on the back, also having the option to insert small magnets for the magnet bar which is typically meant for the Media Dock and then resting against the portion underneath the magnet bar. The version I printed is a very snug fit, so adjustments might be required depending on filament, etc.
Due to the fit I also didn't require the magnets after all but I kept it in the model just in case they do dislodge after long term use ... and maybe because I'm lazy.
I also wanted to route the cable at least a little bit and included a simple cable clip/guide, idea is to have it glued to the back on either Stream Deck bracket quite simply.