I'm not going to pretend to know how to run one, but as a consumer, I know it would probably add some level of confidence, as hotel rooms are separated and distinct. No communal areas. Risk would be reduced to the Johns that see that specific MPA, and the MPA herself.
But then the flip side is, if they wanted to run an incall, they would have already done it. Nevertheless, some girls would probably be okay with that. One of the chicks that works at Golden Lotus also works incall in this shop called Downtown June. Saw it on azn747.