LogoutHook
Installation
sudo defaults write com.apple.loginwindow LogoutHook /path/to/LogoutHook.command
or
/path/to/LogoutHook.command install
Notes
LogoutHook.command highly depends on macOS nvram utility supporting -x option, which is unavailable on 10.12 and below. (Our nvram.mojave somehow fixes that issue by invoking it instead of system one)