Those are the Atlas mountains (North Africa), we have seen them before. At least I think that's the same hide-out.
They're probably worried that Guyot will lead Apollyon to them.
Another issue seems to be a definite lack of people. And no people means no Zoanoids. I guess they sent their last personnel with Guyot as Unuses. If something happens they'll have no choice but to fight.
Hmmm... I have been watching a lot of Steven Universe, so maybe that influences my thinking... but they have shown to be experts in fusions. They created the Branchai Hyper-Zoanoids, and of course the Unus, and their third member - Cabral Khan - based his entire super-power on biological fusion.
Since they apparently have no cannon fodder left to turn into even more powerful Zoanoids to fight for them, and they feel like everybody is breathing down their neck - might they not attempt to fuse together? If two Unuses, relatively speaking weak, can merge into a Dimer which is geometrically more powerful, what would happen if two Zoalords merged together? If their power increased geometrically, could they not be a match for Apollyon?