I got a super cheap single suction cup mount on Amazon and a Morgan Hat Lanyard from the MMCs online shop and I clip the lanyard around the roll hoop and have attached the other end to the mount. Suction it between the roll hoops and so far have not had it come undone... except for the first time I put it on when I hadn't cleaned the surface before sticking it down; you need to make sure that the surface is super clean before you suction it because any dirt or road grime will make it lose its grip.
Here is my first test of the suction mount and camera from a couple years ago, the audio cuts out at the end for no reason.
Here is center mounted with a passenger, this is one of the first long trips I recorded and you will see me checking to make sure that it is still stuck down.
Charlie, Former Editor Morgan Owners Group - Great Lakes