As a fitted, using a laser properly is just common place. I used to use an old Stanley FATMAX red laser I had since starting fitting kitchens, a long, long time ago. Recently I got into a green laser by Dewalt. Man it’s good. 3 different planes of green line, perfect accuracy. So good for setting out a room. You’ll see those green line in the last wardrobe post I wrote.
Anyways, here’s a few pics of it. Well worth the cash if your in the trade!