His low credit was due to medical bills for large surgery fo this wife, everything else was ok, they had car payments and credit cards which they paid on each month, but were not high payments.

@Jay Hinrichs casually mentions golden nuggets like placing an extra washer/dryer in your master closet, or painting your copper pipes white so they look like plastic to fool the thieves. 

If you don't like your electric bill, turn down the thermostat and put plastic on your windows!

Large plastic barrels?

Paid off all the plastic and moved to the next one.- it's always good to see another young investor utilizing this great site!

We have tried plastic and aluminum.

When my new washer and dryer were delivered, they would not set up the dryer because the dryer vent was plastic and not metal.The house had a completely finished basement with drywall and carpet and a wet bar.

and at the end of the day, we need to be able to use common sense in getting into a door.Yes, you will need a WiFi set up to control the lock at your location and a very cheap subscription if you want to control the locks remotely - but you don't have to.Beware of shiny, good "Apple" design looking products made of cheap and light plastics, especially when it comes to longevity and the heavy mechanics needed to withstand millions of physical movements and human force.Also, remember the water- and weatherproof factor.The "on top of door deadbolt" solutions are NOT preferable over the inside lock solution.

They have tons of brand new equipment, they plastic wrap entire loads of dirt, etc. 

The current tenant happens to be elderly, on disability and has had a recent surgery.