Start by using your real TER handle so people know who they're responding to.  Many board memebers wont give recommendations to an alias.  

My doubles experiences have always been positive. I start by choosing an escort I've seen. Then I ask her if she has a doubles partner. Many escorts have friends they work with. Ive also had doubles sessions  initiated by the escort.  

If the escorts have done doubles before, check their reviews. Nothing is guaranteed, but there are ways to increase the odds you'll have a good time.