I am assuming I should only apply for one loan approval since pulling my credit score/history will lower my credit number. 

DSCR loans are based off of down payment, credit score and either actual or market rents so it helps to supercharge an investor's real estate goals and net worth.

Take a look at this chart: FICO Score Pct of Population Default Probability 800 or more 13.00% 1.00% 750-799 27.00% 1.00% 700-749 18.00% 4.40% 650-699 15.00% 8.90% 600-649 12.00% 15.80% 550-599 8.00% 22.50% 500-549 5.00% 28.40% Less than 499 2.00% 41.00% This is how likely a borrower is likely to default on credit extended to them.

What documents do they require, what credit scores do they allow, how do they verify previous rental history, etc.?

The reason being I have to build up my credit score before I can get approved for a loan. 

@Blake KirbyHere's an excerpt from the Redfin article you referenced:"The metro area with the highest risk of a real estate dip during a recession is Riverside, California, with an overall score of 72.8 percent, followed by Phoenix (69.8%) and Miami (69.5%).

:Class A Properties:Cashflow vs Appreciation: Typically, 3-5 years for positive cashflow, but you get highest relative rent & value appreciation.Vacancy Est: Historically 10%, 5% the more recent norm.Tenant Pool: Majority will have FICO scores of 680+ (roughly 5% probability of default), zero evictions in last 7 years.Class B Properties:Cashflow vs Appreciation: Typically, decent amount of relative rent & value appreciation.Vacancy Est: Historically 10%, 5% should be applied only if proper research done to support.Tenant Pool: Majority will have FICO scores of 620-680 (around 10% probability of default), some blemishes, but should have no evictions in last 5 yearsClass C Properties:Cashflow vs Appreciation: Typically, high cashflow and at the lower end of relative rent & value appreciation.

I also have a credit score of 756.

Hold on to the cards forever (closing accounts or opening new cards can impact your score).

When getting a DSCR loan whose credit score is the lender going to use?