I know it's a line of credit, but would I receive a card / account number?

Ultimately, setting up and maintaining an LLC comes with annual administrative costs so another thing to consider is if your cash flow is ready to support these additional costs. 

Everything checks out except they have terrible credit.

I have a personal bank account, two LLC's each having a bank account, about 10 credit cards with 2 of them being business cards. 

It is difficult to cashflow in year one of your house hack for a couple additional reasons: 1.

When you refinance, banks look at your property's value, not your personal credit.

We have excellent credit and can quite easily qualify for a mortgage.2.

In addition to this forum, you may also be interested in PassivePockets.com - our foray into helping investors make better decisions while evaluating syndication and passive real estate opportunities. 

@John Mason, lenders will look at your credit history, income and assets held to determine your eligibility for a 15% down payment conventional loan.

I did pay for the additional membership level and I'll say that I feel that it's worth it for me.