Yes, let's focus on the other questions as it's been proven a bannable offense multiple times to play other accounts with your multibox guys.

Regarding monitors, The smallest I can get away with on my alts is a 24" 1920x1200 panel with the 4 wow's set to 800x600 resolution. Anything smaller and unless I get up close to it I can't read the fonts. That should give you some basic math to work with. This is with the UI scaling set to .64 I think. Hope that helps.