I also have a drop slot in my building for checks, and allow tenants to drop the payment off at the bank if they want.

We're approaching that phase since we have 8 conventional loans and are keeping one slot open for a  new personal residence. 

I'd rather get a 120-200K property that cash flows and I would save and focus properties on that level until all 10 (or 20 if my wife goes back to work).I can look to the 60-90k houses once I get pass my Fannie/Freddie slots and have to resort to portfolio loans.

If I get a 3 night orphaned slot I'll lower my minimum night stay ( a pain on Airbnb, easy on Vrbo) since I can get $300 to $400 per night in the summer. 

Hate to see average investor tie up their 4 great mortgage slots on no appreciation assets only to make a few hundred bucks a month total cash flow if everything goes right.. ? 

I also have a drop slot in the building that they can put rent or any other paperwork/communications they need to get to me.

The property needs slot of work from new kitchen and bath to new windows, etc.

Some married couples will even apply for loans individually so they can have 10 each.Once you have used all those Fannie and Freddie slots, you'll either need to pay off a loan to open up a slot, or seek portfolio lenders (loans that are NOT backed by Fannie and Freddie) which typically have higher interest rates and can have shorter terms and amortization schedules. 

Also I have worked with slot of out of state investors that have done flips here

Nails should be right in the center of the slot it gives you.