Recommend printing from TPA flexible filament. I printed this upright on a Prusa MK3s, 20% infill, no supports and it came out perfect.
Knocked up a quick mount for the session, will work with a turtle fin SMA print as well (has the recess for it) the angle is 35 degrees.
The GoPro is secured using velcro strap
Mount secured using zip ties.
eSun TPA 95
Print upright fine, can also print on the side.