I agree that you should include this as a part of your interview with potential Ts. But understand that what you are asking/wanting is a boundary issue and agreeing to this up front could lead to a malpractice suit.

Now, there have been times when I have been in such a state my T has asked if I would like her to sit next to me, if I would like her to hold me, and both my Ts ask if I want a hug.

You may want to phrase your inquiry as "what are the boundary issues in situations where I need you to sit near me, ...?"