Dual monitors using a laptop as a second display. This guide assumes that you are using a Debian based distro (X11 only). Both devices must be connected to the same network.
# find an unused output
find -L /sys/class/drm -maxdepth 1 -type d -name 'card0-*' -exec sh -c 'if [ $(cat $0/status) = "disconnected" ]; then echo $0; fi' {} \;|cut -c22-|sort