Old school alignment guys; gauge mount idea. What am I missing?

I couldn’t even get a print out last time because “the printer is broken”. The boss kicked me out due to the tech getting nervous because he couldn’t figure out how to do the alignment while I did. If I hadn’t stayed at the door and walked in periodically I would have gotten a stock 1974 alignment (which I specifically asked not to get) and would have had no idea what alignment numbers I would have gotten at all. Then I got an argument out of them about the toe-in and how I should run a slight bit of toe-out.

Oh, and the sensors were all over the place. They kept popping off when the tech turned the wheel because the arms would hit the fender (always good for the paint) and in the end, pretty sure they were low on the wheel and giving wrong readings.

So, whatever inaccuracy I get due to run out will be far better than dealing with those yahoos again. And I still don’t see how the laser alignment machines see that runout anyways.
The way the machine sees the run out is dependant on the machine. Some roll the car a certain amount and some jack the wheels and rotate the wheels. When the wheel rotates the sensor measures runout and compensates for the runout whether caused by the clamp set up or the wheel or ???.