[Richard and Rhonda]

There is a way to do exactly what you want.

Instead of mounting an articulating arm to the panel. Mount a pair of parallel arms, just like the arms on the front suspension. As you slid the panel out on the drawer slides, you could then go up with the parallel arms. If you engineered a simple mount on the TV end of the parallel arms you could then rotate the TV 90 and you are good.

You may can picture exactly what I am talking about. If not, I'll draw a sketch.