Ok, so what is it exactly that you’re trying to solve here?
The lens calibration has nothing at all to do with the laser, bed size, or anything other than the lens of the camera. You could glue your camera to a wall and calibrate the lens with the dot pattern, then mount the camera in the machine to do the alignment (that’s the part where the machine matters).
You’re not moving the dot pattern to different places on the laser bed, you’re moving it through the different parts of the camera view:
The calibration wants you to place the card pattern so it fills one of those 9 squares in turn, starting with the middle, then the 4 sides, then the 4 corners. Nothing to do with the laser at all.