you can bend and tie them (I use bent coathangers) to control the direction of their growth. LST is the term (Do a search if you don't know much about it).

Put one pot in each corner 8" in, and direct the tops of the plants in a clockwise direction. Put two in the center leaving enough room for the last pot in the middle. Like a #5 on a set of dice. You should end up witha a nice even canopy.

Try using a screen when they hit 12 inches or so. (Scrog)

My toughts on the matter anyway.