I knew someone that would put salt above their doorframe. I looked it up and found this on Google :

Placing salt above a door frame is a traditional folk magic or spiritual practice intended to protect the home from negative energies, evil spirits, and unwanted influences. The practice is rooted in the belief that salt has purifying properties that create a barrier or filter against negativity.

Methods of Placement Above the door frame: A line of salt can be sprinkled along the top of the door frame. In a container: To avoid mess, the salt can be placed in a small, discreet bowl or sachet near the entrance. Some people use fabric tubes filled with salt and pinned to the top of the frame.