Thanks, @simonsmark. Three 30" monitors sounds pretty amazing as well!
If there’s physically a way to mount your monitors in a portrait orientation (e.g. using a VESA mount) then it’s likely that you’ll be able to adjust the angle in System Preferences > Displays.
Having monitor(s) in portrait mode can be very convenient in some circumstances (e.g. browsing a document or reviewing a long web page). And they don’t take up very much desk space.