Yeah, those seem like good descriptions to me!

I think the most important thing as far as boundaries are concerned in therapy, is that they're discussed and made clear at the beginning of the relationship. Both therapist and client need to have their boundaries respected, and this is only going to happen if both parties have a clear understanding of each others'. In my experience things can go terribly wrong when one person transgresses a boundary that they didn't know existed, or when boundaries seem to be suddenly and drastically changed some time into therapy.

Ideally, both parties should sign a contract at the start of therapy that lays all this out. The specifics of the relationship that is being entered into should be understood by everyone. It's informed consent, same as they do for medical procedures...