when it comes to boundaries, IMHO, less is more. start with what is your bottom line NO CAN DO will not happen, i'm hopping the next rocket to the moon event.
and then ask what will you do should that event happen....then ask yourself if you are really ready to ACT - if for example your boundary crossed response is that you will leave the premises, will you actually leave if needed? where will you go? what if it's 2am? is there a friend or hotel nearby?
think thru how YOUR responses will play out. have a plan in place, a good plan, not a sort of thought i might plan...