i have a w202 and a hard wired the v1 to the light inside the compartment box (that's a wire that's not hot when the ignition is off) make sure you tap it BEFORE the compartment switch (which makes the light turn ON when the compartment is open (and i think is the only way to do it since the switch is ON the light fixture itself)

but then you would have to run a wire all the way up from the A-pillar via the headliners to the rearview mirrors (i just have mine sitting low on the windshield rite above the the dash...mounting it higher dun help much IMO)