To mount it you could get you some of that 3M brand double back tape, the stuff with the foam core. The 3M brand seems to be a premium product and cut right it should hold the stand on forever.
I've seen arm cups (cuffs) made out of cross sectioned (split) 6" PVC pipe, which turned upside down would make a stand. Just rivet it to a thin plate, lay a bead of epoxy down each side where the roll leaves the plate, then use the double sided tape to mount it to the detector.
Better yet, use the correct length of those screw rivets put together with red loc-tite that way it would be really flat on both sides, then epoxy the sides at the rolls, then mount it to the detector.
Mark