For our xBs they should describe the 4-wheel alignment as "front wheels will be checked and aligned, rear wheels will only be checked since we can't adjust them unless we use shims".
I am on NF210s. Installing the springs changed the alignment on all four wheels. A 4-wheel alignment got the front wheels back into spec but the rear wheels are now slightly out of spec. Not enough to worry about tho.
Put on the NF210s, get a 4-wheel alignment, get the printout, relax and enjoy the improved stance, ride, and handling!