This article gives a very helpful starting point.https://www.biggerpockets.com/blog/core-four-real-estate-teamThere are a lot of markets that do have a large selection of MFH that cash flow.

Companies to use for this?

You mentioned about the BRRR strategy, this is not as easy as it sounds.

Feel free to message me or comment below if you're working in this area or have any advice for a new wholesaler.

Are there other ideas to make this deal work? 

This is where you buy, live in, rent it out, repeat.

This will give you insight into their experience, expertise, and knowledge.

Did you ever find anything on this and did you take Joel's mentorship?

This is classica analysis paralysis fodder.

I’ve have two proposals from two companies that do this type of build.