Here's what I replaced my 5-up with (had a 6-up layout that only had 5 monitors).
https://www.elitetrader.com/et/threads/single-large-monitor-practical.307614/page-4#post-4848393
55" 4K to replace 4-up monitors all the way!
Kept a 1920x1200 on the side.
Info is already up when you need it. When coding, way more info up at once means a lot more productive. Night and day difference.
Smaller than that, 3-ups with a centre monitor work very well.
I had three 28" 1920x1200 in 3-up portrait and it was great! Very nice to use.
(Wish I'd taken a photo of that. I've only got images showing one monitor in portrait as a right-wing.)
(I don't even want to remember the 4-up 22")