Blinky Lights Galore!
These people know at least some of the basic tenets of long-term survival. If the electric fence fails, they can lasso anyone shuffling into their yard from almost any place near the front door. Once they board over the windows, they will be ready.
Note that a display of this nature also helps detect those in the process of conversion. Such a lovely holiday display ought to bring out smiles of happiness. Anyone who walks up the path without smiling should probably be summarily executed.
