Perrin should say that it is for cars with FMIC only. You can reach the back pretty easily if your bumper cover is cut for an FMIC.
I've never removed an 06/07 bumper cover, so I'm no help there. Personally I wouldn't do it for just a license plate delete. Return the Perrin and plug the holes for now until the FMIC goes in. By then a little bird told me that you will be able to put a CNC-machined delete on that has no hardware showing and may have the SECCS logo on it.