Further, we need to account for a $10k “reserve” for what will be repairs / maintenance as the property ages.  

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

However a lawyer and accountant may be best to consult there much smarter then myself  

Is it just as simple as entering your account information in their mortgage payment portal and making sure the payment comes from your account?

I have approx $10m in retirement accounts.

I'd be very open to that.A High Yield Savings Account at 4.5% yields a close to 2.5% after-tax amount.

@Gary Bonds owning a few rentals is not a business at least according to my accountant, Best to attempt to qualify using your personal income.

We didn't anticipate the housing market slowing when it did in August and now we are holding a flip that for all accounts should sell.

However, if for example, the company did not install or disconnect the washer and dryer correctly (such as leaving a valve on) while water is turned off prematurely, causing damage, what language do you put in the Lease to also hold other parties accountable such as ALE and appliance install company?   

Escrow Account Setup 9.