You'll want most of that cash for just the furnishing and closing costs though or potentially even more of it if you want to outsource the setup.  

One unit is vacant and need to put in W/d hook up and get tenant and then potentially furnish for MTR next year. 

Furnished finder shows 250 total furnished rentals in Grand Rapids area.

Having said that, if you're going to live there for 2 years, by the time you move out, market rent may very well have risen another 8-10%, and you could go the furnished, monthly rental route, which will demand even higher rent. 

I've been looking intensively in Tampa, but there's practically no inventory in neighborhoods that work here.I am considering listing a potential unit on Furnished Finders, which has an average length of stay of 90 days.

Multiyear lease - you will have to invest some money into furnishing the property.

Anything rented more than 30 days is a long-term rental, even if it's furnished and includes utilities.

I want to furnish it myself.  

We spend a lot of time furnishing and styling these units. 

I have 5 properties of my own listed there, and I currently manage an additional 25 listings for others on Airbnb (plus VRBO, Booking.com and Furnished Finder) as a licensed real estate agent.