I feel like value-added opportunities would be easier in SFH over MFH for resales because families would purchase SFH differently from MFH which could be something to keep in mind in the long run as a safety net if you needed to sell because renting wasn't sufficient.

The formula for calculating DSCR is straightforward:DSCR=NetOperatingIncome(NOI)/TotalDebtServiceNet Operating Income (NOI) represents the property's income after operating expenses.Total Debt Service includes all debt obligations, such as loan payments, property taxes, and insurance.A DSCR ratio above 1 indicates that the property's income is sufficient to cover its debt obligations, while a ratio below 1 suggests insufficient cash flow to cover debt payments.Lenders usually have specific DSCR requirements, with higher ratios indicating lower risk for the lender.

If you are in an expensive state, having a separate LLC per property might be too expensive to justify unless the equity in a given property is sufficiently large.

If you show sufficient W2 income you should be fine. 

@Arthur LeaoThe Roth IRA likely does not factor into your strategy as you have described it.The Roth IRA is not sufficient to purchase a property outright or with a non-recourse loan.The Roth IRA cannot be combined with personal funds to create a deal, since it is not sufficient to do a deal on it's own.It sounds as if you want access to the income.While an IRA may invest in real property, doing so is a way to diversify the IRA savings, not a way to bring that IRA money into your real estate deals.

The contingency inspection was sufficient for me as a buyer. 

Or is only an LLC sufficient?

They 5 are: Character (reliability, integrity), Capacity (sufficient income or cash flow to service the debt), Capital (the borrower's net worth or how much of their own money they put into the deal), Collateral (the value of the assets that secure the debt), and Conditions (the borrower's situation and the state of the economy or local real estate market).

The idea that a vacant house has enough equity in it for you (or in your case an investor) to purchase it, paying off the mortgage/mortgages and any an all liens and still have sufficient equity in it makes no sense.  

In couple years we are looking to purchase a house, would it be sufficient for our landlord to provide a letter to our future lender that we paid on time?