Being how you system is layed out, the method you used on the Home screen probably works out best.

I seen in the other thread, they already have you on the right track to control your Shield.

That center speaker is killing me. It is to far from the viewing screen and more than 10° difference vertically from the left & right tweeters.
If it were me, I would see about getting a stand that matched the color and texture of the AV cabinet, then stick that center channel on it to get it to the right height. If that looked to creepy, then I would see about mounting the center channel straight to the wall just under the screen.
Also some blocks to put the towers on to raise them a little.
I see why you put the screen as high as you did (that light switch). But you can get some pretty cheap automated switches to replace that switch with and control it from another location. That way the screen could have been mounted a little lower.