I’m pretty confy with out them. You can only have them on the rear windows, passenger rear included. But not in the front.
Keep in mind police, at least here, will stop you for a routine check quite often if you have an old car with dark windows. Mostly because is sorta of a Balkan/east Europe thing here in Italy to have a car like that.
So they check if you’re wanted, have a record or if your ok with papers and such things.
And if they really don’t like you, be prepared to open all your car for a drug search.