With regards to the spinning nuts for the rear license plate....

I popped off a few of the fasteners holding the interior panel/trim, reach up with long nose vise grips and simply bent the nut back and forth until it broke. Now the "nut" is in 2 pieces.....one outside and one in the vise grip.

I'm totally unimpressed with this design. Seems to me the simple black or white plastic ones that go into a square hole from outside the vehicle (as used on MANY cars) is a more than adequate design. This is either over-engineered or a poorly installed fastener....maybe a combination of both.

Good luck.

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Jim