We build interactive touch software that are designed in landscape and portrait orientation. Having a mount that rotates allows us to demo different interactive programs with a simple turn of the screen! This product is super simple to install and has a very narrow profile so it sits super close to the wall. I did not find any documentation on how to lock the screen because the screen we have installed is a little top heavy and wants to rotate on its own. But besides that... honestly this is a perfect solution for our applications!