Rather than 4x monitors, how about bigger and higher resolution monitors? I have 2x 27" 1440 monitors. They're fine to read at 100% scaling, which gives me tons of space to put things. I often run four columns of windows side by side - two columns per monitor. Going back to 1080 in the office is a big downgrade. You could do a similar pattern with ultra wide and/or higher resolution.
Monitors with a built in KVM are tons cheaper in total, especially if you care about high refresh rates. I share my M27Qs and a mouse/keyboard between my personal computer and work laptop this way.
I'm not sure that I get the need for three laptops, but you do you.
Haha, came here to say the same thing.