damj, Here in Florida we're not required to have a front plate but I was given the mounting kit anyway when I bought my car. On close inspection I noticed two very faint dimples in the front bumper just above the bottom opening , or just below the upper grill however you want to look at it. Judging from the hardware that comes in the kit it seems you are required to drill two small pilot holes where those dimples are and use the sheet metal screws supplied.
I chose not to install the kit since I don't have to mount a front plate. If your still unsure maybe call the service dept at the dealership and ask them. I'm sure they'll let you know the proper way to mount it.