Somehow I missed the question about the camera mounts... My preferred GoPro location is on the aft end of the boom. You may need to get a little extension to get it far enough back, but that way you can see what the skipper & crew is up to, as well as where the boat is going. Next best thing imo is a head strap, so you get a sailing POV.
Aside from those locations, I've seen people mount them to the forward crossbar, the bows (angled back towards the trampoline), the mast (angled down towards the trampoline), or the deck angled directly across towards the crew. I've also seen some creative use of a selfie stick, but that requires a crew member with a free hand or a way to secure it to them! Any view from a chase boat or drone is always a plus, too!
Here's one of my videos to see where I've secured it in the past:
https://www.youtube.com/watch?v=FSfAU72wfvQ