I re-homed 2 female cage mates and still provide several sleeping options incl: 2 pouches 1 hammock. They have the option to sleep separately or move around and sleep together, but they mostly pick 1 pouch and that's it. They've changed their favorite sleep spot 3x already, every time I gave or made something new, with the exception of the no-sew hammock I made them, they didn't seem to care for it, I took it out for a while and will try it again later.
Back to topic (sorry),
They weren't cage mates then, but did they come from same breeder?
I would definitely follow the recommendations already given, keeping a really close eye on them, but would add that it wouldn't hurt to get a second, temporary type set up for incase you may need to separate them, then reintroduce. Also it doesn't hurt to have a secondary cage anyway. This could be one that is a good size to use when cleaning main cage, as well as a clinic or travel cage if ever needed. If the circumstance arises that you need to separate them temporarily and reintroduce, you can alternate your gliders in the cages after a few days. It would be similar to pouch swapping, but you would let 1 glider stay in temp cage for about 3 nights, then the other for a few nights, so each glider is in with the other's scent. By the time this is done, they will have both of their scents in the home cage and then you can give them a couple of days or so before cleaning cages. Or let them both sleep in the temp cage while you clean the home cage and get it all fresh for the 2 of them.