Multtiple SAV monitor housing ?

Hey about a month ago i picked up a 8 inch Savannah monitor, i revisited the pet store and they still had My monitors original cage mate at a special bargain, 67$ for tank set up light and monitor, anyway i bought the second.
I'm about to construct a custom enclosure, and i was wondering if i can house the 2 sav's together, or do i have to sex them first and can only have Female male pair? Or since at one point there were 3 in a pet store tank its safe to assume its a communal species... I haven't heard anything about housing multiple Savannah's together but have seen pictures of groups up 2 6 in a tank. The last thing i want to do is introduce my Now 8 1/2 inch baby, to the new larger 11 inch sav and have them fight. If they are Male/Male can they still getalong? Or am i better of not introducing them at all. ??? Even if i cant house them together is it OK to have the 2 meet outside their individual homes or will that cause them to fight if same sex?
Please any info would be greatly appreciated.