For a genuine new car look (as seen at my local vauxhall dealer) fit with two mismatched self tapping screws. Plates must be slightly off centre and at an angle. For the full effect, burr over the philips slot by using the wrong screwdriver and crack the plate around the holes by overtightening.
Saw a number like this last year. Obviously left the job to the trainee.
Seriously - use tape, no holes.