you just need to go to CCC and create a group. http://www.youtube.com/watch?v=RZAkCoaq384
theres a tutorial vid.
what im saying about the even numbers, is that the center of the image will be broken up by the edges of the monitors. this will make playing very annoying. by using 3 monitors you have a central unbroken image and then peripheral vision.
if you want bigger, rather than a wider, image i would suggest going for 3 monitors in portrait mode. head over to widescreen gaming forum if you need any help on that.