I had to mount my license plate because Washington is a front plate state.
I've seen Corvettes with removable front plates and thought I'd make one with some kind of quick release. After talking to a friend about it, he suggested using a CB antenna mount
Here it is with the license plate
To remove it, I push in (it's spring loaded) and turn it
Then it pops out
Then I just put the Fiero badge over the female part of the mount in the grill, and it's ready to show
And here it is with a custom Fiero badge I made.