With a 1 inch drop on a GTI PP, I was -1.9 on one side, -2 on the other with the Eurosport camber kit. Zero added NVH, but you'll have to use a different camber solution if you want more than that. I'm up in the air as to whether that's enough.
It also makes -2.4 seem pretty reasonable with some of the other solutions, as they add significantly more neg camber than the Eurosport kit.
Update to my post. I'm at -2.4 with the above mentioned setup, with using the slack in the lower ball joint bolts and the strut mount play. I'm going to file the holes a little at both ends and see if I can't get close to -3.