Numberplate looks great in that position but if it does hit a speed bump at speed it could do a lot of damage to the lower bonnet if it is too well fixed.
How about incorporating a long piano hinge on it, that way if you hit a ramp it should (in theory) just swing back without damaging the bonnet. You would just need a small spring to keep it held in the correct position. You would of course need to make sure the spring was strong enough that it didn't start pushing back at speed, that would be naughty with all the new forward facing cameras!
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