I used to have a 29 inch UW with a 24 inch either side. Decided to up the UW to a 34 inch 1440p and replace the 29 and one 24 with it. Now I'm in the market for a 27 inch decent refresh rate to accompany it so they are roughly the same height and resolution again. I think that combination works well for GIS, excel and looking as design and engineering documents all at once.

At the office we sport dual 32 inch 4k monitors, it's a lot, quite often too much. You do get a lot of content on the screen but I find myself only using sections of it to avoid having to turn around to see the edges and feels wasteful, I don't have that issue on my home set up. I also find myself having to check formatting and how I'm sending it displaying information as if I run full screen those not running the big monitors end up with a crushed view and can't read what I sent.

I'd also always recommend not cheaping out on keyboard mouse and other bits. Frustrates me that employers tend to dige out $5 dell keyboards and mice, in the right hands a mechanical keyboard and mx master significantly helped productivity and makes life far nicer for the user. Similarly lighting is overlooked, don't want glare on your screen all day or being day in a dingy corner of the house. 

I went one step further with audio as well, I got annoyed at teams calls and uncomfortable headphones. Ended up with a quite cheap mic on an arm, some Phillips shp5000 and an audio interface. It's overkill but the headphones are comfortable for long periods, sound better than most headsets, I can turn on speakers if I need them and just swing the mic over if I get a call. And most importantly, no faffing about with settings ever, it's configured to work and i haven't touched a setting since the initial setup years ago, honestly love the simplicity compared to everyone else in teams meetings who is mucking about with their settings.