How can I mount my front number plate without drilling holes
Rob, why don't you get some really long powerful magnetic strips glue them behind the plate recess on the back of the bumper. Glue the other magnets on your number plate and when you attach it to the bumper use some Polystyrene lining the really thin stuff to stop it scratching your bumper and its water proof so the rain will not damage it. Make sure all 4 lengths of the plate are covered so it holds on really strong.