see if someone can do 1 slab) The flooring pricing is a little high if you pick $3 a foot for floors, $3 max to install, overall good quote but everything just a touch over what I pay. 

In order for Ohio law to be properly applied, you'll need an accurate family tree.   

They drilled into the house to install the service and mounted a device on the side of my property.

Agree with @Eric M. the deals can LOOK like 20% COC but unless you are self managing and not properly accounting for all the cap/ex and tenant issues that do happen over time it's typically not real. 

So you lost 3 weeks worth of rent, a $99 deposit, payed 2/3 of the cost of repair, and still have a broken machine because it should have been replaced and not repaired.Conversely you could have just skipped the insurance altogether and had the HVAC properly replaced by competent technicians a day or two after it broke and gone about your merry way avoiding all of the mess.

I just want to set it up properly in a way that makes sense.

How do I properly determine the market value of my home ?

But one  thing that is universal is proper noticing.

If using a property manager, is it appropriate to have a property manager install cameras (or other security systems) on your behalf or is it recommended to work directly with tenants?

Simply solve those issues being the nice guy and maintain all control to use kind and proper leverage.