FWIW Sto n sho made me a bracket to bolt under my right (Pre-L) bumperette. There is a springed pin that can be pulled and the twin pins will slide out of the mounting bracket. I normally don't drive with the plate on, but as NH requires a front plate I could always 'produce' it and put it on in a second. It has not happened (yet).
Not sure I recommend it as the baseplate alone looks out of place, even without the license plate on. I was hoping it would be less obvious. If I could hide the mounting bracket behind the grill that would be great but the mesh is too small to allow the twin pins to pass through. At almost $90 it's pricey too.