I'd say that 25% is the prevailing number you should be thinking about but it won't take 5-10 calls to regional banks, credit unions, etc. to figure it out. 

We were lucky that we locked in during Brexit.We are in Denver, CO and have 790+ credit.

What should we look for in credit cards?

great job, not the cheapest, but did accept credit cards.

And this is coming from a guy who routinely melts down on my cell, cable, internet provider tech lines.

My primary thoughts are to used some of these funds to structure the business, pay some internet and marketing overhead, and use funds for EM.  

Let's assume 2 or more prospective tenants submit applications, pass the credit and background screening, and meet my other minimum criteria.Must I accept the the tenants on a first-come first-served basis? 

-only debt: $100/mo for student loan-credit score falls within the excellent range-~28k total to put into a deal, leaving 8k for family emergencies

Also, keep in mind that business credit will be assigned to each LLC separately.In other words, to get blanket funding, you may want to consolidate, however consolidation may undermine asset protection.

Don't spend all your ammo (7%) on one shot, because if a costly CapEx expense comes up or something unforeseen happens, you don't want to have to start using costly credit cards for operating expenses :)Good luck!