I think it's the Accutoe ES? It's essentially the same setup. Just the laser is on the front, the mirror mounts in the axle. The variance between karts is the same no matter where each part is mounted.
We use Proline because it's a toe, and a camber gauge in one package. No removing tires, or taking the kart off the scales to change this or that with the system. Again, the variance is going to be the same no matter where each end is mounted, either can be bent or misaligned, slightly. It's due diligence on your part to insure it isn't on both systems.