What sort of head lights do you have?
Some for example the LED head lights on my wife’s mini don’t need them and it’s possible this is the case with some HID models.
My golf has head light protectors and these came with a set of specific deflectors designed specifically for the head lights I put them on the protectors and then just take the protectors on and off when they are needed.
Other than this a set of cheap stick on things are essentially all you need, they don’t ‘deflect’ they just block the part of the U.K. headlight pattern which would normally light up reflective road side signs, but in France would shine in the eyes of other drivers on the other side of the road, so they really don’t need to be anything fancy. The same approach can be achieved with a small piece of black insulation tape applied to the right part of the beam.