When my first one went back I had to change the plates. The rears had screws in as I expected, but the lazy wotsits at the original dealers had just run a drill through the plates and put self tapping screws straight through the metal rather than using the pre-threaded holes!
I always thought they looked a bit wonky... The front ones had been done the same, self tappers straight through the thin plastic of the holder, rather that the thicker bushes provided.
Changed the plates on an X-Trail a few years back for the same reason, they were fixed with double sided tape so strong that it pulled the paint off the bumper.
Alan