In the end i decided to go with the old school setup of:

Left pc, battlenet 1, Antonone, Antontwo, etc
Left pc nr 2, battlenet nr 2, Billyone, Billytwo, etc
Middle pc, battlenet nr 3, Charlyone, Charlytwo, etc

Names just examples, but you get the idea.

So its fast and easy to figure out where each toon is, pc and monitorwise.