Just a reminder that security head bolt kits are available for not much at all online. They use security torx bolts (like the kind you see in public bathrooms on the turnpike, etc). They are far from foolproof, but they do make it slightly more difficult to remove your plates.

Edit: because most randos don't have the bit or key to remove them. Anyone worth their salt absolutely will. But it doesn't hurt to put them on.