Fixing number plates

I would just use lots of Velcro and double sided sticky pads Roy, you seen mine? I did it on mine and they haven't fallen off once!
 
Going to try the Velcro first Luke Ste is going to do it for me at the weekend.Will take some pic when it's been done
 
When i replaced mine, I screwed mine onto the front and used sticky pads on the back. As someone said, the front is curved. And tbh, it's easier to take them off with screws than it is pads. I had a bit of a mare trying to get the old plates off because they were stuck down so well.

iirc - There's screw holes in the rear bumper for plates anyway.

I wouldn't feel comfortable with velcro personally.