There are websites you can go to and get a POF. 

Alleged Payment Plan: no lender will move forward without sending a letter to them.Evictions: make a list of the cities showing up on the background check and then log into the corresponding court websites to see if any landlord-tenant cases pop up. 

Start with Jim Dahle's "white coat investor" website and Youtube channel and Reddit subthreads.

They were month to month when I bought the property, but I never increased the rent since they were good tenants in the beginning.I already paid for a lead inspection and building inspection for the property via the city of detroit's website, so I know what the condition of the property is in and what repairs are needed in order to get it certified.

By chance have you checked out the BiggerPockets property management finding tool on the website?

They have a lot of free info on their website as well. 

Property taxes have gone up a bit, but so has insurance-all the little bits add up over time.I understand why you say this, but saying more supply will lower renting costs is a false narrative "Spruce Goose".

An example problem statement that I may have stated (and built the software for) in 2003, when I started investing full time: Build a tool for lead generation that collects county records from the county recorder's office (and property card data), finds the recent first mortgage defaults  from trustees websites or public filings for properties that are between 1000 and 1700 square feet, in a neighborhood of 90% like-kind properties with greater than 20 parcels, houses built after 1978, that can cash flow at current rates when fully leveraged. 

Just by googling 'buy a house in Nicaragua' I now found the cheapest SFH going for $44k on one of the brokers' websites, a lot of them in the hundreds of thousands USD. 

I also use a website called cozy.co to screen all of my potential tenants.