Make sure that you look at the booking and details on what the person signed.

Is there a standard formula that takes into account the fluctuations of interest rates?

Those list are being sent to thousands of people, and the person sending them has to make some money too. 

House hacking will also give you some personal "property management" experience.

Did you do the video course or personal mentoring?  

It's considered personal property, it's not attached or affixed to the property like a site built home is the best I understand it

In comparison to personal residences, investment properties may demand additional documentation and underwriting requirements from lenders; nonetheless, a credit score of 730 is generally regarded as acceptable and may qualify for advantageous loan conditions.

With that said, it doesn't me it can't be something that the right person wouldn't be able to take care of.

@Josie Sevilla, Lot of personal preference. 

Would a cash out refinance to a LLC factor into my personal DTI?