I want to focus on multifamilies for scalability, but don't really know the best way to start. 

It's a difficult line of work but I'm enjoying the freedom of entrepreneurship and satisfaction of building scalable management processes. 

Plus, it seems much more scalable, at least toward the beginning, than buying-and-holding SFHs and multi-units.

I used to have a goal of getting more than 10 loans in my name but when I had 11 of these rentals I realized that owning properties was not scalable past 20-30.

Its a little more detailed than a homeowners extension, but it will provide you with coverage that is far more scalable as well as the option of listing an LLC or business entity as an additional insured.  

It may be that you need a portfolio of performing notes for cashflow, some non-performing for scalability and some real estate for the leverage and tax benefits.

That same wholesaler then just gets properties under contract and assign it over and forget it - The back end wholesaler only worries about the disposition side and ensures  the deal is transferred to a reliable cash buyerRinse Cycle Repeat   Multiple wholesalers can be going to on investor to do this (basically pass their deal over for it to be generated quickly into 60% You see the scalability! 

Scalability happens faster with getting MFR's and house hacking would allow you to live for free if the rents are good enough.

He calls that 'scalability', and if I could sit at my typing desk and generate that kind of dough I would gladly dump all of my rental properties.

While not necessarily a scalable tactic for institutional investors, this is another way to find commercial real estate deals off-market.4.