I’m not sure there is a definitive answer to this question. Obviously the more camber, the more inner edge wear however whether this is premature will also depend on your mileage, how hard you corner, tyre pressures and also your expectations on what wear is acceptable.
I was recommended to aim for 2-2.25 deg but to expect tramlining and uneven tyre wear, however when the bjs were fitted we could only achieve 1.5 equally on each side. Haven’t done sufficient mileage since then to form a view on how the tyres are wearing but would say that it drives nicely on these settings. Fwiw have also used a small amount of toe out both front and rear.