You wont get MLAT on V6, but you can see MLAT on radarbox
MLAT is where aircraft are not sending their positioanal information in the signal you are picking up from the aircraft. However if there are 3 or 4 receivers nearby that are MLAT capable, the position can be triangulated on the server and shown on the radarbox.com map
The V6 software is not MLAT compatible so MLAT positions will not be shown on its map.
Your flightstick is MLAT capable but you would need to run it with a Raspberry Pi to display on radarbox.com
Alan