Expected Camera accuracy

I don’t ont know how to use this forum yet but Ill ask my question and see what happens.

I’ve set up my LightBurn 90 camera and am getting decient results on a 700 x 500 100 watt Orion Laser.
How much misalignment especially in the corners is respectable. I’m maybe 2 mm in the corners and 1/2 mm in the center areas. Is it possible to get it better?