From past experience I would judge you are going to need a brace for that screen. I got one of the original Cee Bailey 20" screens and even though it was made of pretty thick acrylic, it shook like a wet noodle. (got to be hard on the attachment points !) About 6 months later, CB came out with a brace for it that was very similar to the BMW offering.
Both cost too much money so I didn't get one.
I didn't care for the CB ( shaking and vacuum problems) so I went with Madstad and was happy ever after.