For what it's worth I didn't VTC that question (and it's still just about clinging to being open at time of writing).
I think ergonomics questions pertaining to home-offices can be on-topic here, I'm really on the fence with this particular question though; it's certainly a little out-of-the-norm but that doesn't make something off-topic. Given the unusual setup I doubt most people versed in workplace (including home workplace) ergonomics would know the answer but a question being difficult to answer doesn't make it off-topic either.
The OP might stand a better chance of getting useful info on Medical Sciences - but it would have to be framed very specifically as a question discussing display use under such circumstances in the general case. For very good reasons Med Sci doesn't allow questions that have the slightest whiff of being something that might be considered "Personal medical advice".
I think Kilisi made a good effort at an answer - and the OP certainly seemed happy enough to accept that.