steeda adjustable upper control arm

i have this control arm, looking to start installing some parts i've got laying around, which will have me adjusting the pinion angle.

is this adjustable while its bolted to the car? or when they say without removing from the car you just have to unbolt one side.

i am contemplating going with the bmr adjustable upper control arm, and selling the steeda piece because it doesn't look like its adjustable while its bolted to the car, like the bmr is.

i've got the upper control arm mount now, but its not on the car yet. plan on throwing the mount and anti squat brackets on.

stock ride height, what set of holes would you recommend with the new mount? i thought i read something about the steeda arm not fitting in the one set, i could be wrong though.