Theft-proofing a convertible with no steering lock

I make sure never to park my convertible with the top down anywhere............I do have those anti-theft door pins, that way they cant use a coat hanger to get into the car, .

Sorry but this is misplaced. 2 seconds with any knife, or many other objects and they will be in. You mights as well leave it UNlocked so they don't kill the top or break windows.