Most cops wont bug you unless they want to tag you for something else, (I never did) if its mandatory in your state and the cops do it as a routine, get a color matching bra ( they lokg good), and attach the plate to the bra.
Did that once with my Firefox !

In Ohio is mandatory, but cops wont stop you for it, unless you give them PC.
In the last 4 years I lived in NJ, PA, OH and never had a problem, even drove my Jeep those 4 years with AZ tags and I was never stopped. :roll:

Good Luck !