2 screens is a terrible idea because the center of your view will be the deadzone of the bezels. If you don't bezel correct then it's just as bad for different reasons.
3 ontop of 3 doesn't work good either beacuse of this reason. For racing or flight sims I can see it, but shooters the most important part is the very center.
Only way it would work at a reasonable level is, tear the bezels off and probably dremel out the frame so they fit together (it will still have a bit of a deadzone even doing this). Or find a double wide monitor and the computer will recognize it at native res of 3840x1080 or whatever it is.
To be completely honest, I don't think Surround settings are even available for 2 monitors because they realize it wouldn't work very good. (*edit: Surround settings don't show up for 2 monitors only, confirmed)
You can get around that with hacks and tricks to force a resolution // force surround to work. Or some software that allows stretching windows.
TL/DR
You are wasting your time with 2 monitors for double wide gaming. Get a third or use the 2nd one for videos, music, forums, etc.
