Security doors, windows, security cameras.

"I can't get into specifics" from a guy with a profile pic of himself wearing a suit and shades, flashing double thumbs up at the camera.

The doorbells are Ring (https://shop.ring.com/pages/doorbell-cameras).

Has anyone tried to do showing using lockbox and Camera.

If you just need a camera or 2 or a motion sensor to alert you on your phone, if someone breaks in, are there options?

The interwebs will only give you part of the story in a world where Photoshop use and wide-angle real estate camera lenses are widespread.

The physical work part involves cleaning out units after people leave (and leave trash), mowing the grass, maintaining the fence and security cameras if you have them, over-locking unpaid units, conducting auctions to enforce your lien. 

Has anyone tried using a 360 camera like the Samsung Gear 360 or Ricoh cameras and found success?

I haven't had any issues largely because cameras are a good way to scare people away.

A door area camera might be nice in a sketchy area, but Texas requires door viewers which work well with dusk to dawn led lamps...and a decorative metal security screen type door is probably better security than a camera.