I actually don't watch TV,and haven't for over 20 years. But I do use a 4k 50 inch TV for a monitor. You are correct about distance away. I measured and it's 89

I actually don't watch TV,and haven't for over 20 years. But I do use a 4k 50 inch TV for a monitor. You are correct about distance away. I measured and it's 89cm my case. The back lights on ones (~$250) that are lower priced can crap out after a few years. They are strips of LEDs chained together. The entire top half of bottom half will go dim. I have disassembled and fixed but it's not worth it. I also use a laptop on a stand and stand at my desk. Both are easy to move as the desk is a square, drafting style setup with the top laid flat. The TV hangs from the ceiling, and can swivel left right. Maybe you could set your desk in the other direction.