Typical things that go wrong are the relay, fan motor, capacitors, and thermostat.

If its the back wall & not the side walls can't you just run a rod and mount each side of the rod on the side walls.

To communicate with it, we'll install a Netgear Nighthawk M6 mobile hotspot, inside a locked wall mounted box in the basement.

Also these new pumps have ecm motors, plus most have built in timers and thermostats to make operation easy and cost effective.

There is no way I would allow anyone to make any holes in the roof and there is no need, there are lots of mounting brackets available so there is no need to atatch anything to the roof itself. 

If not, I can put you in touch with our BIC for Charleston/Mount Pleasant.https://brgonline.com/agent-careers/

Anybody mounting refillable dispensers and filling them with bulk gallons of shampoo, conditioner, etc?

Which means you'll be finding motors and relays at Grainger and other outfits.Best bet; find a RELIABLE, HONEST service company.

I started in a similar way as you. 2018 was my education overdrive year and then in 2018 I acquired a quad in mount airy with an FHA loan.

@Ben Freeburg I can tell you from our experience, we completed a duplex in June of 2020 in Mount Vernon, and then after getting it rented easily at top dollar, we purchased land to do another one (the one we are currently waiting for lumber).