I would hate to install a stacked washer and dryer (or any appliance) only to find out I picked out an unreliable, costly, model.

Since the BRRRR model would have you doing a refi shortly after, taking a higher rate in the beginning doesn't really matter - if you can keep more cash in your pocket, all the better.

Instead, develop a business model that you will follow.

I see a need for a modeling software for this type of investment.

But, what if you had the right business model, your ducks are lined up in a nice neat row and you made only $4 million, or $3 million, or $2 million.

Those money investors are analyzing deals (often all over the country) and modeling out the risk/reward of the venture.  

@Bruno Araujo the answer to part of your question is yes, investors can 1031 exchange from investment real estate into a Delaware Statutory Trust modeled after Rev proc 2004-86. 

Back in the high FC days when we'd find ourselves in bidding situations, we had a rule: we run our model and whatever number we came up with is what we'd go with.

LOL, the ANTI arbitrage crowd, while correct in some of its positions on the risks and pitfalls of the STR arbitrage model, is, IMO, neglectful in not giving credit for a proven business model.  

We can follow that model in real estate.