Ensure that you conduct your own screening process to ensure that applicants meet your criteria.

A 6" deep aluminum beam for this application doesn't sound promising.

What is their showing & application process? 

If it's through a platform - ie, if I accept Zillow applications and they provide the credit check that the applicant paid for - then I would accept it.

Location and Market Trends: Evaluating the importance of location, neighborhood dynamics, and market trends.Mastering these underwriting tricks and understanding their applications will equip us to make informed, profitable investment decisions.

Regarding skip tracing, Tracers is a good resource as TLO has been declining more folks the past year When I had my HML shop we had an Accurint product that was called fraud detector for loan applications.. it was amazing  what is out there. 

Your agent will have the comps and she might know more about the property than you may know because she has access to the applicable  information or she knows where to get it.  

There are lenders that will allow up to 85% financing on an investment property and 90% on a second home purchase assuming applicant meets program requirements. 

What is the best way to screen international applicants? 

They do NOT partner with banks and they do NOT do anything but fill out credit card applications.