Deflectors aren't going to do anything - except perhaps keep a Carabinieri happy.
For years I've put a small mask of black insulation tape - between 7 o'clock and 9 o'clock, if you visualise a headlight as a clock. Equally it does nothing, but it does save you a tenner at the ferry port.
Recently I've completely given up. I'm gambling if I get stopped, I'll claim the computer does it automatically; I'll show them the speedo switched to kilometres. Unless they have a portable MoT headlight tester they won't be able to challenge that. I'm guessing they know that so many executive cars do this through software these days that they have completely given up policing deflectors.