Not used Go Pro Mount, but used other RAM mounts. Not the cheap but very very solid.

Look at:
RAM Go Pro Mount

There a a myriad of mounting options to combine with them including suction cups.

I have a universal phone holder I fitted to my M3W and it is very good.



Andy S.
WiziMog 4/4 4-str 2000 & 5-speed MTW 2014