Taking care of someone's asset is a responsibility that you should not take lightly. 

Ive been considering motion detecting flood lights around the property.

Most people would spend a minimum of $25 PSF for a light remodel- replace kit cabinets/counters, floor, paint.

.- Lighting fixtures- Smoke alarms / carbon monoxide detectors- Window and door repairs- Water heater maintenance

Until someone from Norada can shed light on this it's not a place to put money. 

You should focus on duplexes in Huntsville for a house hack" - Jane in Montana;  great, except there are an incredibly few duplexes in Huntsville"Hazel Green is an easy commute from Huntsville and shouldn't affect your rental prospects" - Joe in Chicago. 

Check out this article that sheds light on how they come into play with this strategy.

Likely just light cosmetic, fix ups, bath and kitchen remodel, landscaping. 

I carry a very small, very light 8 shot 22 caliber revolver everywhere that's legal.

It sounds like most of your issues came to light during your due diligence.