You might try 4'x6', landscape format. We typically start by centering the object around 5' above the floor. Might work better a little higher but you can try it out with tape.

Have you tried to look at the product's specification or ask a question directly on the post? From PC you find these actions on the right of the screen, for mobile scroll down. Hope this is helpful

I think some shelving would look wonderful, keep the styling quite simple so that your eye doesn't get pulled away from the TV when you are trying to relax. A couple of floor plants either side of your entertainment unit would keep the electronics company and finish off the look quite nicely.

oh that art over lounge is old & need to replace bc sick of looking at it. also can’t change placement of the clock as there is a bracket & dont want to patch & paint the wall. The other wall in dining room will only reflect another wall so not sure but im going to buy them first and play around with them as I’m a visual person. also what colour would you recommend I go? ideally I would love to change my curtainS but can’t afford to do so. & my rug but I have an old fur baby who at times has accidents so going to wait on that for now. Was thinking of painting my antique tv unit & table white; what do you think?? Btw... chairs are brown not black.