It is actually an elongated crevice, one on each side (hot/cold) so they are not even in contact.
That's weird because I found a few that keep them together and they happen to be breeders who infrequent forums, they just breed and don't chat much about it online. After asking one about this, they reminded me of the lack of understanding on forums, reminding me how I complained about what was being posted on the other reptiles I had success in breeding. I have bred over 100 species of reptiles with great success on even some of the most complicated. This success was willingness to try different things (with common sense and previous investigations) and observe their behaviour. I think I listened to the experts fairly well before this introduction, but I do understand the common knee jerk reaction found if you post on a forum.
With that said, they recommended keeping them like this for a while and once they get closer to a year, to move one out to another 2x2x1 (I have many of these). They recommended keeping them in 2 deep x 4 long x 2 high when adults together if planning on breeding or to keep separate for feeding in the cage, then hook training to handle. The feeding while living in the same quarters was the only difficulty in their experience.