If u're interested to know how to check your alignment at home, all u need is a flat ground (or make some calibration with the spirit level)' a spirit level, two long strings longer than the length of the vehicle, vernier caliper or a measuring tape and some googling. This is the method used before lasers came along. You can achieve accurate results if u had some patience. You rear toe and camber should be identical on both rear wheel(according to specs), Your front wheels needs to be parallel and steering straight. Once you know your rear wheels are correct, you can correct your front wheels with reference to the rear wheels.