Probably a good solution on a new lawn would be a system of hoses or PVC setup of sprinklers on some kind of timer.

Just send me a DM, I have a solution to what you need

It is already equipped with a fire suppression system and monitoring.

Have you explored any other solutions than bleeding for 2-3 years?

As far as your proposed solution seems like it should work in terms of getting you a “first position” HELOC.  

You are too stupid to call me because you are a troll....not looking for solutions.

If you get creative you can find solutions.

At that point, it's worth researching and finding a solution that better meets your needs. 

At 7 doors it's not necessary, but of course software can save you time, especially if you grow.If you plan to scale beyond your current size, I would echo other folks above that you should look into one of these more robust software solutions sooner than later (re: Buildium, AppFolio, RentVine, etc.)

If you're concerned about issues, make sure to have a camera pointed at the driveway, smartlock that logs all the comings and goings, noise monitor inside and you can even place one in the backyard, and lastly get damage rental insurance on each booking that the guest pays for by baking the charge into the nightly rate.