BlueMax said:
The Brits would decal the tag number on the front of their Bugeye/Frogeye's.
That's a load of spherical objects!
<span style="font-style: italic">Some</span> cars have stick-on number plates - particularly race/rally cars, but it isn't the normal thing that is done. Holes drilled in the section beneath the grille and a bracket similar to in the picture above is the way if you don't have a bumper.
To be legal, number plates in the UK have to be vertical so stuck on the sloping part of the bonnet isn't legal, although plenty of people do it on A-Hs, Spitfires, MX5s etc and no one seems to worry about it but it would always be possible that the police or MOT tester would pick it up if they were being fussy.