My setup in the office is a screen dedicated to Outlook, a screen for my code, and a screen for documentation and chat.

I know some people in the office who made one or both of the side screens vertical, but that doesn't work for me. Vertical means I'm tilting my head or my eyes up and down which doesn't feel great. Also horizontal side monitors are in my peripheral vision, vertical side monitors extend too far up to be in my peripheral vision.

I wouldn't want my center monitor to be vertical because then I couldn't easily put code side-by-side. I'd need to take over one of the side monitors which then would mean looking between them requires looking off-center and with a gap from the bezels.