I'd recommend a broker since they have lots of different options to see what fits best for you.

"You can't be paid for raising money if you are not a licensed broker."

They are your stereotypical ‘salesman’ type brokers, more about just selling any and all homes than they are studying the markets.

I would advise working with a broker instead of going direct, since many DSCR lenders have different guidelines.

Does anyone know any good brokers that they could recommend for a self-directed Roth IRA?

Costs about $150 to list on MLS - you can google “your state” and “list on MLS” and you will find a broker (etc) who will offer that service.  

should contact the broker for some options 

Our company, Jamison Management Company, was founded in Redondo Beach, California in 1995 by owner and broker, Larry Jamison.

You may have success with Multifamily DSCR Loans for 5-10 units - then really once you are at 11+ its going to be a whole additional/different set of lenders - commercial mortgage brokers probably your best search/bet if its significantly above 6 units in your buy box

If you don't plan to occupy the home, I would love to a lending broker in the area to find you the best deal to either do an investment loan or DSCR type loan.