Hmm one of the better looking RoboCup style installs I've seen in a while
most of the people just cram the damn thing in there and wedge it with something which looks soooo ghetto IMHO. What you should do...since it looks like you got it nicely centered and since the gap looks almost the same as the other buttons is to simply make a tight fitting collar out of black felt. Then slip the collar up the back of the TT so that you can't see past the edge of the lip...this might look more, "finished". I dunno I've never pulled the RoboCup myself, but from the other installs I've seen I'd not be satisfied w/o doing some more treatment to try and make the area look more complete.
Regards,
James R.
2001 A4 1.8TQMSXP (Koni Coil-Overs, Neuspeed 19mm Rear Anti-Sway, StopTech A4 Brake System, SS Brake Lines, Oettinger Pedal Set + Dead, Oettinger RE's 17x8, Yoko AVS Sports 225/45/R17, European Xenon Housings, Bailey BPV & RS4 Grill)