as far as well reviewed, top-end providers

I have never had a problem, and I feel much safer with that stuff with me than in my car. Do whatever you feel is necessary for your safety, but if you are seeing reputable ladies you shouldn't fear your belongings getting ripped off. On the other hand if you are into picking up casino girls, or streetwalkers, that's another ballgame!

I have left valuables in the car before but putting such in the car trunk outside might be worse than taking it in with you.  I have plaid it both ways.
I have taken both phones in but usually, I switch phones in my belt carrier to my hobby phone.  Generally my items are in the room with me.  I like to empty my pockets onto her dresser next to my clothes.  Things can fall out of pockets getting dressed.  I do same as home, dress first, fill pockets second.  
I do not especially remove credit cards but I have reduced the CCs I carry routinely.

usually bring my hobby phone with me.
Condoms and breath mints are the only other things I'll have on me.

envelope.  Once we begin disrobing, my clothes fall where they may; after dressing I put the cell in my pocket and pick up my car keys.  Sometimes the envelope has already been removed and other times it is still laying there.

once again, this newbie says thanks for the help!!

hobby phone,  donation,  and car remote,  that's it.