Put the lug nuts on to hold the rotors square on the hubs/ axles. Be sure that the rotors sit flush/ flat on the hub/ axle mounting surface. I have seen instances where the hub register has a radius larger than the rotor hat, and it is possible that the outer radius of the hub interferes with the hat. Anyway, after checking these areas, and securing the rotors, spin them by hand to be sure they run true. If they run true, ask someone to apply the brakes. Watch the caliper rotor for movement. ANY flex/ movement isn’t acceptable.