My A3 is 8P so it may be a bit different but here is how I tackled it.
I cut mine like this:
This is before the cut, the grille would not fit
Cut the centre piece:
Attach the rings base and licence plate:
Done:
Note:
I painted the aluminum bumper with PlastiDip. That way you can’t see it through the grille and PlastiDip won’t chip.
Hope this helps.
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