That goes a long way towards making the conversation about what you want possible ahead of time.  If your research shows that one provider already does two-girl sessions, so much the better, particularly if you can find any reviews of who she has done doubles with in the past.

... mostly because your reviews are all of mediocre/average experiences.
Maybe that is a hurdle, both in terms of your approach, and the provider's opinion.
On the other hand I'm guessing you have persuasive loot for this enterprise -- you might need it to solve that problem.
And then I looked again at the TER MN Top Ten; almost every one could organize what you want. So perhaps that's your pool. Two or 3 of them have recently offered doubles.
Or, on the cheaper side, there are several MNE women who might get together to do it for you, like the ones who offer "4 hands." Two or 3 of those have handcuffs they'd like to use more often

I recommend finding 1 who you like that offers duos.

It’s harder to create chemistry if all three have never met.