Got an Insta360 One with waterproof case for £140 on ebay.
Quality is OK for my needs. (I put up a quick 360 test vid)
Used suction cup on instrument dash which works well but will try on tail at some point.
Doesn't work at all with my Android phone but can do basic editing on PC.
Cheers ChrisLooking good. Got to love the Guzzi