I keep all of my Bps, and my boa, one to a cage. I can see no benefit from keeping them housed together, unless of course it's breeding season and you have two healthy, adult animals you're attempting to breed together.
Keeping them together longterm, can only lead to more stress on the snakes. Say they both want to be in the same hidespot (to thermoregulate.) They would both have to squeeze in there. Make a hidedspot big enough for both, and one would feel insecure in there because it would be too big.
