Egyption Uromastyx Enclosure Question

I am planing on getting a pair of baby or sub-adult Egyptian uros. I want to house them together and will be building the enclosures myself. I'm making two separate enclosures just in case I have to separate the two later for some reason.

So my questions are has anyone one had problems housing Egyptians together? Would a 6'x2'x2' or 6'x3'x3' enclosure be big enough for an adult pair? If not what size do you recommend? I have read on the forum that one member kept a single Egyptian in a 8'x4'x4' enclosure. I don't have room for an enclosure that big let alone two.

Any help or suggestions would be greatly appreciated. I'm still in the planing stage and want to get my measurements right before I start getting my supplies.