I just wrapped a piece of rope around my handle at the yolk, and covered it with electrical tape, then used a handlebar mount on that. It wobbles across the wakes, but it was good through the turns. I’ll see if I can track down the video this screenshot came from.

That line you can see through the handle is the far shoreline.

This summer I want to the GoPro on a course bouy and use a remote in the boat to take burst pics coming into the ball and leaving, see what that gets.