Those last two on the right look like they're basically behind you. How do you use those?

They are about 45 degrees to the right of center. I turn my head or swivel my chair.

This is a beautiful desk setup. Do you prefer having the gaps in between?

No honestly I'd rather everything were flush, but that's the best I can do with the stand and monitors I have. The monitors aren't all the same make/model.

woah thats bonkers! What do you do with all that real estate?

Pretty much the standard tools that most people have open all the time I guess. I just want to see them all all the time without having to constantly switch windows or hide the thing I'm working on.

Music, messenger, Discord, Slack, 2 or 3 instances of my IDE, source control UI, a terminal or three, documentation for the thing I'm working on, notepad++

Dude. If you get the third row PLEASE take another picture and share it.

Your set up is magnificent.