Yeah, bodywork mounts are bad. Something solid like a frame or subframe is a better idea. The good thing about my Replay cameras is that they make billet mounts for them. The bad thing is they cost about 5X as much as they should. That's what I use to mount my front camera to the mirror stem.
I stay away from tank mounts. Having the screen in the way creates too much distortion and there are times that I would really not like having the camera pointed at my instrument cluster, for reasons of personal privacy
I find that helmet mounted cameras result in video that gives people motion sickness, so I switched to mounts on the bike. One thing that I've learnt, over the years, is that you want to have the camera connected to something on the bike with a short lanyard. It doesn't do to have a few hundred bucks worth of video camera bouncing along the road behind you.