You could always get the GoPro with the sticky M3 bracket and mount camera there.
I spent about 20 mins yesterday in Milford putting all these fittings together so the camera was level and point down the road.
As on the way in it was pointed at the side of the road.
Had the sticky thing but the other go pro case I didn't have left it behind.
With it mounted front and center of the bike we will be able see the lean angle better.
I did record the entire ride back from Milford Sound to Te Anua.