At last :D
Made up my mind and tried dual view on my main computer, using a 17" bought from my pal Strickmabil some years ago :D
Working like a charm, much better in BG's, WG and Dalaran!
from left to right
Mac - 1 client
Dual - 2 clients in dual view (17" and |24" my main|)
Quad - 2 clients on a vertical position
Till the next change!