It’s correct how it is. It’s acting as an adjective, as if you said “red shelter.” “Migrant’s shelter” would mean the shelter belongs to one migrant. “Migrants’ shelter” would mean the shelter belongs to a group of migrants, which is also incorrect because they do not own it. Hope this helps :)
The two big problems for me are (1) increased slowness and lag, and (2) phantom notifications (a red 10 dot in the bottom notifications but I click in and see that it’s empty)