Had mine fitted for about a week now, it was quite simple and I decided to run the cable along the off-side and then the button near the OBD port.

My thoughts on the sounds:-
1 - very quiet but not bad
2 - very quiet but not bad
3 - sounds like it's switched off
4 - the best for motorway driving, I'd say somewhere near to the original sound "dynamic"
5 - very nice v8 sound, quite loud and certainly turns a lot of heads.
6 - not enough of a rumble but my mate listened who used to have an R8 and he said it was very close to that

It would be good if you could pick other cars, like AMG and have them in the sound profiles buttons!!