The you lad Alex is coreect in what he says, but there is more to it!
Porsche lists 2 badges, on larger than the other, only one is now available, and its the one for the facelift, ie the on that fits in the convex without protrusion, the older one from the pre face lift sits on the convev curve, ie the upper half.
If Alex read up on it no doubt he may have read where to apply the only available one, ie lower convex.
Personally I like it in the higher for the simple reason that prior to me owning a 911 id I was stuck behind one in traffic up tight, I could see the word Carrera in the higher possition better!
No such issue on the 997 ehh...