A negative cap rate might be a good screen since it would indicate either income too low or expenses too high.  

I did it from my phone in my insurance agents office (we needed to know the llc name in advance).

Expect a phone call!  

Our office is our smart phone and tablet.I executed a joint venture with Elite Real Estate Systems who provides agent websites and BoomTown (an unbelievably robust CRM/back end) along with leadgen.  

The reality is that in every single case if the landlord had properly screened the applicant they would not have accepted them. 

For reference, you can go to images.google.com and upload a picture and it will show you every where the picture has been posted on the internet.So just for giggles I put his references phone numbers into Facebook.

I checked my phone messages this afternoon , 4 jobs got the OK .

Tenant Screening: There are a bunch of sites out there.

I've used them for tenant screenings and landlord advice in the past.  

I believe, the only way to get started is by getting on the phone and speaking to locals/local investors, then driving out to these places and seeing them for yourself.