They really look great. I'm not sure I've ever heard cohabitation is looked at by most breeders as a positive. Info I've gotten is that WE may think the snakes are snuggling together but in reality they are competing for the same space and are very solitary creatures unless it is breeding time.
But I have read also that some boas have laid together outside a den entrance and used each other for increased heat during basking. I'm really not sure where BCs fall in the mix. I know gardener snakes will exist and thrive together.
Beyond all that, I think they look great and I'm stoked for you!
I think IF you decide to house them together, you should get the biggest enclosure possible.