You are like many others who are getting started and unfortunately your generation is screwed because of the amount of spending is older generations have done and put the debt on you which also has led to record inflation.All you can do now is plan for the future and don’t force things but invest wisely when the time is right.

The 2-3% points in extra cost are worth it if you plan on using as I described above because the use would be for a few  months at most and due to that short term use you can survive a rate adjustment up.But, if you have no plan to payoff the debt like when using for a down payment on a long term hold why pay the extra cost for flexibility and have the additional risk of the adjustable rate with the amortization looming when you can get a fixed rate second mortgage. 

Some people only want 10-20% of their outstanding lines/debt balances available while the other 80-90% to be in fixed rate notes.

For instance, if there was a total of $250K of debt on those properties that woud leave you with $350K of proceeds to use to purchase $600K of real estate.  

If you are using it to buy a turnkey property which needs to produce cash flow to be considered a viable deal how does buying turnkey(Little to no cash flow) combined with HML(High interest only debt) make alot of sense financially? 

We have no debt and good credit scores, do we have any options for making this work?

I can buy a 2-4 unit with 20% down vs conventional can only buy a 2-4 INVESTMENT property with 25% down 4. there are options where DSCR loans dont repot to personal credit, helps in not having to show a bunch of paperwork or not one person in a partnership has to carry the debt5. way less paperwork to close on this loan type vs a conventional loan. we care about the income of the property you're buying and it's ability to service the debt of the property whether we use long term rents income, lease income, or air dna/bnb income.6. easily buy in partnerships, add people to your operating agreement, its as easy as that so bring partners into a deal. helps with scaling and raising capital or getting partners involved7. gift funds allowed to close on these as well, and like I said earlier, there's only a 10day seasoning period of funds with some lenders so that means you can literally have a private money lender deposit money into your account 11 days before closing, and you can use those funds to close!

Clearly the note is more than just evidence of a debt, right?

Her mother is willing to (co-sign) and has excellent credit and debt to income ratio that will more than allow but I’m not sure the best way to structure this for the house to still be in our name?  

Incurring debt before you have sufficient earnings to support that debt.