This must be new, if true.

I worked at an Apple retail store during college. We were taught to put the screens at a certain angle but it was a gut feeling angle learned through practice, and not measured. More senior people would correct you if you were off.

They did mandate putting the bezel, mouse, keyboard, etc. at specific grains in the wood that were consistent across the desks though to ensure they were lined up without having to bust out a level-like device.

Overall everything was made so that retail employees would continuously clean up the displays as they walked around the store (even while helping customers without them realizing it) so that the store always felt perfect. They had a phrase for it but I forgot now, it's been almost 15 years now...