I have settled on exactly the same setup! It's pretty great. My right-hand monitor is a terminal 24/7. My center monitor is code—I used to think I'd want vertical for code, and it is nice sometimes, but at my current job I benefit from having several files open side-by-side more than I benefit from seeing more of one file. It's a 4k monitor and I have it fractionally scaled so that I can read comfortably, but I can also fit up to four files side-by-side on the screen at once. It is very useful. And then the laptop screen is for Slack, docs, AWS dashboard, whatever is useful at the time.
I use the right hand monitor for slack and documentation. Sometimes a terminal, very occasionally code that I’m reading (not writing).
I also used to think is want a portrait monitor for code but it turns out that the Jack of horizontal resolution actually bothers me for code. Maybe with a higher resolution monitor it would be better, but for now, I prefer to use a large but landscape monitor for code.
