I had my rear blade suspension re aligned after fitting eibach springs its easily done on a 3d laser alignment machine, the BIG issue is that the ecentric bolts that are used to adjust the camber are very exposed to the elements and as such they seize up completely so if turned they end up ripping the lower track control arm bushing away from its casing. Your also meant to set the design ride height by loosening the lower track control arm bolts but these seize up also.
When i first fitted the springs the above happened when i tried to adjust the camber and set the ride height and it ended up with me dropping the rear suspension off the car completely and re-building it with new bolts, braided hoses, Poly bushes and having the lot painted and powder coated at a HUGE cost.
If you dont set the ride height then it puts extra twist on the track control arm bushes and they eventually rip away from the outer bush casing.