Last November my dad died and left me with 8 pieces of investment real estate I need to keep full so I can pay for mom's nursing home. At the advise of some TUGgers, I went to a property management company, rather than doing the online thing. Reason being, I found out that often the potential renters don't want to give you all the info (SSN, etc.,) but will give it more readily to a "professional company" who will run the screening. The place I went with is part of a real estate company here in town, and they said they would just do that part of it for me, or could collect rent, etc. I am using them for everything but wouldn't hesitate to use them just for the screening part if I so despearately didn't want all these people on my doorstep every month telling me why they can't pay.... Anyway, see if you have a property management company in town that will do this. I think it's about $37 for each potential screening. And, one of the potential candidates had a jail record, so I really felt like I got my $37 worth on that one.
Good luck, and just my .02.