You assume they would. As soon as the UBI hits, the 300$ huts become $1300 huts. And we have the same pattern all over again.

Enable them to mobile, independent of UBI. Enable them to get food, health care (real stuff, not the obamacare crap[1]), job training, child care (if needed), relocation and housing assistance. Don't hand them money for these things (apart from UBI), but help them with a health card that handles medical/dental/etc. Give them a "credit" card that they can use with a set of well scrutinized vendors for relo/housing. Etc.

[1] when my $dayjob-1 died, I had to sign my family up for obamacare. About the same amount I paid for my old good plan. Much higher deductibles, covered almost no meds, little hospitalization. The thing needs to be fixed, not repealed. Fixing it is going to be hard as it was designed to fail and be replaced with single payer. So there is that.