Glow in the dark Crucifix 

 CC has a small Crucifix over every door in her home, I have done this since I was young.

That way you are protected and reminded to always look up for Goodness.

I also have  a Prayer Cards of Saint Michael pinned to the inside of my door or if the door is left opened all of the time it is pinned to the door frame.  Thank you Saint Michael.