Establish a relationship with a provider in terms of frequency so they know it's not  alone off thing. It's mazing how many ladies will meet your request

I've seen websites for several ladies that say they offer "out in public" dates at roughly the same rates, but I would think she might have security concerns -- maybe you're thinking of doing something embarrassing, or might even be LE hoping to get her to make a damaging admission outside where they could be watching.  I am certainly NOT saying that's your agenda, but she might think that it could be...

I'd try just being up front about it, and scheduling a longer appointment, and asking if you can bring a bottle of wine (or get her to pick one out, if she's concerned about getting roofied).  Let her know you want to start off slowly, and I'm sure she'll be happy to comply.

I am flexible, and if you want to have a little meet and greet before the appointment... Sounds lovely.

When I was a major player back in the 90's, this was a typical appointment for me. I would always arrange to have a drink or coffee first to give both of us a chance to back out if we didnt like what we saw. Only had one or two where I decided to roll on out. Paid for the drinks of course!