I can only go on 8 year old knowledge in WA, but hopefully it's a starting point for you

Even if she is of sound mind, if she cannot live by herself, and none of the people are deemed suitable, she will be placed in an emergency care facility until a spot opens up. I know it's hard, believe me, but being blind and deaf, and also having suffered a stroke, she will most likely need to live in a nursing home. Yes, it's going to be hard on her, and it's going to be even harder on you and your family. If she's of sound mind, you may find that, while she actually finds things to enjoy, she may play them down when talking to you, almost as a manipulative guilt trip. This is totally natural, it's a huge change for everyone, and she will be finding her new place in her new surroundings. If you can possibly get her to help, it might be time to start finding somewhere she is relatively comfortable with, so that she feels she has some control, as opposed to just being put in the first place that's available.

If you have any concerns about her potential carers, and I do mean ANY, speak to the person/people doing the mini carers assessment. In the absence of any other data, they can only go on what they've asked and observed. I agree with you that the man living with her will likely hurt her in frustration, and with that will come a whole raft of other family and personal problems. I don't think anyone truly knows what they're getting into when they take Mum or Dad home to live with them, it's so much harder than what you expect, and there's so many different things to consider.

Big hugs Leesa, this will be a difficult time - PM me if you wanna chat or scream