If a cash out refinance, many lenders will allow the cash out to satisfy the reserves requirement.DSCR lenders generally let you vest either individually or as an LLC.

Normally, the transfer of a loan from an individual to an LLC will lead to a due on sale clause. 

We are doing 300+ homes so individual LLCs isn't realistic in this scenario. 

It seems like it basically up to you to do the math on how much more you will potentially make selling each unit individually and then deciding if that extra $$$ is worth the number of extra hours you will spend.

I've met plenty of individuals with far more experience than me who have offered referrals, advice and so on but I'm looking for more handholding than is reasonable to ask for someone to provide for free.

The net interest is the sum of the interest incurred in each individual month, so if we can demonstrate that you have no net savings in month 1, it follows that you'll never see a net savings in future months. 

Quote from @Chris Seveney: This really boils down to each individual situation.

When a child LLC (disregarded entity) is used to hold each property, and all of the tax reporting is done on the tax return of the parent entity, does each  individual child LLC need to file the BOI Report, or only the parent LLC? 

Check out padpslit.com, I use the platform to rent out 8 bedrooms in my house individually

Instead, an individual should strive for self-growth and initiative and be aware of how they can add value to members of their team or those who have helped them.