Once you fill the slot you deactivate the listing, your profile stays on Zillow for the next time you need to activate the listingIf needed you can also collect rents through Zillow. 

What is sometimes harder is the reserve requirements that increase as you add properties in your name - especially when you split properties and income between yourself and your wife to have more Fannie Mae loan slots available.  

Kinda wished I did the flip after I filled my 10 conventional slots, but oh well, beggers can't be choosers in this case.

Keep in mind title companies have recording slots in the big counties..

@Hilary GravesI typically do but I hold multiple viewings in time slots on the same day to save time.I don’t typically let someone apply without seeing the house.

Are you running out of breaker slots or are you concerned with overall amperage?  

The old meter slot is covered and this now becomes the sub-panel servicing all the circuits in the existing houseCan't stress enough the importance of planning for all utilities (electric, water, sewer & gas) from the get-go because these can very easily become showstoppers. 

There are slot of people who make student loan payments and the amount they owe goes up everyday because their payment is less than interest is accruing and they will never pay it off.

you mitigate the out of state risk with family member watching the construction crew.but what do you achieve doing this.you end up leveraged to the max  and you TIE up your very very valuable 4 mortgage slots.. only way this makes sense is scale and scale quickly. 

I've truly learned over the past several years that people in general are full of sh*t when they need to fill news slots for 24 hours straight.