Here is my BBS setup
20x10 et22 (this is a net 12mm from stock 9.5)
20x11 et24 (this is a net 10mm from stock 10.5)
I run the OEM tires which are 275/285 with with the slight added stretch I was able to add these spacers:
10mm front which creates a net et6
12mm rear which creates a net et6
no rub and lowered- zero cause my guy knows section width measurements (not just the number aka 275/285 but the true curve) down to a tee with PS4's.