...GoPro mount that is RG specific - remove one of the screws that holds the windshield onto the fairing, the mount goes there, comes with a longer screw to replace the one you remove.
I just mounted the Ciro Action Cam Mount for RG (can't link, post count is too low...) last night, tested it on the way to work this morning. I have a '10 FLTRX and the stupid windshield trim (looks great, I struggle to line up the screw holes every single time... Told a buddy this morning that that trim/shield is never coming off!) The Ciro is specific to '15 and up, but seems very solid on my bike. I picked up a #10 x 1/2" stainless screw and some chrome washers from the hardware store, the screws in the kit were too long for the trim on my bike. Actually bottomed out a 1" screw and it got stuck, loosening the trim/mount screw loosened the trim stud that holds the shield on, and of course, popped the wellnut thru the fairing! I've got at least 3 of thsoe dumb things rolling around inside my fairing now... I plan to leave the ball arm on when I'm not running the cam, it's small-ish and I don't mind it being there when not in use. Planning to post a review of the mount here after Sturgis, see how it does over 10 days and 3,000+ mi.
I have the Hero 4 cam, outfitted it w/ an aftermarket case back to power via USB. I typically shoot time lapse video on the road - no one, including me, wants to watch 40 hrs of riding vids! I used a clamp mount on my Night Train on the fork tube, right nuder the trees, for a 4,000 mi ride last year, worked well. 4-500mi days left me w/ 7-8 min time lapse videos. Caught a bear crossing the road in front of us in Vermont! Picked the cam up on eBay for less than $100. I have way more invested in the do-dads that go with it (batteries, memory cards, and mounts!)