Mounting the deflector replaces the bottom fairing screw with a longer screw and uses double sided 3M automotive molding tape. The deflector can be removed with a little tug but the tape must be replaced each time it is removed.
These deflectors work with or without a lower fairing. They will come slightly below your lower fairing. It's like adding 10" to the top of your lower fairing and 6" to the width of the Sharknose.
I offer these in clear or gray smoked so they do not distract from the looks of your beautiful Road Glide. You can't see them until you get close. However, you can paint them if desired.