whiteline one yeh, stiffest setting for that I never had it on any less but noticed it instantly like you stay strut brace has no effect why I never bother messing up my boor for a rear one.
I think I have chosen the right places to jack up never tried on the wishbones, the back of the car can't remember but when I fitted rear anti roll bar I used axle stand on the rear obviously.
I agree the front makes no difference what so ever really, but I felt that the rear strut brace helped to tighten the back up noticeably before the rear arb went on...
It doesn't really mess the boot up either as its towards the back behind the seats, only really becomes a nuisance when the seats are down, but it can be removed