If you look on your passenger visor you'll see a little round tab with a line through it. You can twist that out and replace it with one of those two clips. One is for sunglasses, the other is for anything (business card, insurance card..whatever). Just twist one off and twist it in the hole.
My '13 has the mount on both visors. I keep my sun glasses on the driver's visor. BTW, there are other accessories that you can buy for those spots. Look at the Ford accessory site. I believe it's all in the owner's manual for you edification.