One of these mounts came with my contour+ and I fitted it to my motorbike helmet for last years trip from UK down to Switzerland,
it worke d so well I've bought another for my second helmet.
The adhesive tape is the 3M type and really gets hold so, much so I never used the safety leash.
I attached the camera to the mount and Without removing the backing off the adhesive, used the bluetooth ap on my Galaxy phone to get a view to position the camera.
Then get a companion to mark around the mount with a pencil or felt pen.
Peel the backing off and stick it into position and your away.
The mount alowes for