Fundamentally, though, hotels shouldn’t be used for it. There’s no means of segregating the residents as far as I’m aware which means they could disappear into the general population at any time.
Looking at Wrexham’s squad, it seems they have 30 players over the age of 21 already, without counting Moore, Broadhead and Coady. Some may have been released but list not updated yet, but that’s a hell of a bloated squad.