oops, Denita, no pics. here are a few from the Houzz store, just for brainstorming. there are lots of consoles that combine housing for the cable box et al with lots of extra cupboard space, so you should have plenty of options. Ikea makes a lot of great pieces in this particular category too, so you could look there. You could maybe even go superlong to take as much advantage of that wall as possible, especially if you go with white or something else that blends into the background a bit.

The load capacity of a single 2x4 is about 400 - 500 pounds. Metal should be about the same . Your TV is only 85. Distributed to two sides it's 50 pounds each. I believe you are over engineering the problem. Couple tapicon bolts and decent lags is all you need.

Call an electrician or audio guy. Get an IR repeater . It will allow the boxes to be ANYWHERE. even the basement or a closet. Or wait for more gambling money, and buy a media cabinet The first suggestion means NO wires showing. https://thehometheaterdiy.com/ir-repeater-kits-explained/

Google images for ”TV wall”. There are so many creative options. Anything goes! My favorites are the ones that use background finishes to frame the TV. (Not framing the TV itself - creating a stylish background for the TV to be mounted on that acts as a backdrop for the TV.) I’m all about drawing attention to the TV with no distractions. You can put any kind of credenza underneath. I prefer closed storage if possible. You can even get creative with speakers and subwoofer shapes, if you haven’t chosen those yet. In some cases, you might want some open storage for the speakers.