If it's only stuck on with adhesive tape, what stops a thief pulling it off and chucking it in a bucket of water or throwing it  clear of the vehicle?  probably get damaged or knocked off when washing your van also? if upgraded security is needed I'd think a hard wired security system would be the best option, I had  this in my previous van due to a break in (triple immobiliser thatcham  apporved alarm with alarm box in back of van as well as cab)