Yes, I'd get it as high as possible. Maybe take it to Mendocino for the weekend or something.
Or, you could find some way to angle it towards the listening position.
I would NOT put it tightly sandwiched between/behind the shelving units. That is, try to get the front baffle of the speaker out in front of the front of the shelf units by at least an inch or so if you can.
Speaker stands or shelves for the L/R or just going to dress up the TV trays
Either way, again try to reduce the reflection points by getting the speaker on the listener-side edge of the support. But, you know, be safe first.
I really like how your display looks. I like the paint color in the room, too.