I've experimented with a bunch of camera angles. I drilled a hole in my windscreen to accept a 1/4 20 tripod screw, with a tripod gopro mount. I can have the camera forward-facing, or in selfie mode. A bonus is I can mount my EZ-Pass there for commuting. This guy will grab onto the handlebar clamp on our bikes so you can get some "behind the screen" shots (assuming a clear screen):
https://smile.amazon.com/gp/product/B07HQ9Q2VL/.
You can use the handlebar/rollbar mounts to get a side angle from your frame sliders and spools. I use a standard gopro mount on the rear for back-facing shots. With enough extensions you can get a good forward-facing shot with a mount on the front fairing.
Some of my videos showing these different angles:
The only thing I've tried and hate is mounting a camera to my helmet. Too much wind drag, and it seems like a bad idea if your head hits the deck.