I do not have any specifics on this however I feel all the information you will need can be found free on here, or by asking people with the right experience. 

Look for a company with experience, good communication, financial stability, and tech skills.

Your closing costs look reasonable to me based on my personal experience (I'm not an expert though). 

I don't even drink the stuff and have no idea what a French press does, but I hear some prefer that method and for this price, I'm willing to experiment with adding this amenity. 

I have rehabbed about 2 dozen units which I consider a fair amount of experience.  

I have experience with both Buildium and Appfolio.

Can someone with a lot of experience in TDs and stock-index ETFs compare these two investments in terms of risk-adjusted returns?  

From our experience (PA) and that of our colleagues around the country- the general consensus for a modular to be considered "real estate" and not personal property it must :-Be a double wide home minimum-Be permanently affixed to a foundation.

I'd love to hear any good or bad experiences.

Feel free to reach out if you’d like to learn more on house hacking (could be a great way to get started), I can share my experience