If you can't get keyclone to work for you, you could always go with WoW Maximizer.

I use dual monitors in horizontal span (22" wide and 20" wide) with a resolution of 3360x1050 and with WoW maximizer I run my main in fullscreen on my 22" and the 4 clones on the 20" at 840x525. They are all quite playable and even the text is legible.

I'd advise using the CRT even if you have to have it on the floor for the time being. It will just save you some headaches of trying to figure out where your clones got lost, or if one of them decided to run away, plus looting will be a bit easier.