I'm with Gilmore on this one.
Multiple ladies at one location means a lot more traffic, and a lot less discretion.
You have to figure out a schedule which suits all of you, and then hope that you have the same style of living (smoker/non smoker, cleanliness etc.) You also have to worry about the hours and the company the other ladies keep, because you don't want neighbours complaining that drunk men are dropping by at all hours of the night.
It's far easier to just rent the incall for yourself. Discretion is much more easily maintained, and there is no drama. Additionally, you can write off the place as your office space - so it really only costs you half the price anyway.