Also be mindful of existing or proposed restrictions - I don't recall anything extreme proposed in Ludlow or Dover, but Wilmington is being very aggressive in all but eliminating STRs.

I do find it odd that you are restricted on a primary residence.

HOAs can also put restrictions on rentals such as the percent of rentals vs. owner occupied.  

One they fought hard and took it to the state AG for privacy, which should have no pricy restrictions on it anyway. 

I'm also not interested in condos/townhouses as I owned one previously locally, and it really restricted what I could do. 

Nashville, IN is known to have rental restrictions on STRs in the area, so I would double check the regulations.

You may also want to consider a 3% down conventional loan on a SFH / SFH+ADU OR 5% down conventional on a 2-4 unit - this way you won't be restricted by your current FHA

I found a PM that restricted the total number of days owners could stay.

I can admit there are likely good reasons for these validations and restrictions for Property management professionals and accounting gurus, but for a small time landlord like myself they come across as annoying.

For 3-6 months of seasoning, the appraised value can be considered, though LTV restrictions often apply.