ohhhh,

How about an "L" bracket mounted from the bottom of the middle of bumper.
This way you will not have any damage shown.

Also, I have Velcroed a plate on my a4 over the euro plate.
Here is an example of a camaro.
Front license plate install: The British Way! - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums - Camaro5.com