There has already been much discussion on this forum about personal opinions and avoiding legal requirement of the front plate.
Here in Ontario, Canada, law states a front plate is required.
When I went to pick up my new 2006 XF, I expected the front plate to be already mounted. It wasn’t.
The dealer said he did not have the heart to drill holes in the front bumper of this beautiful vehicle. He indicated that in about 1 year, Ontario will no longer require the front plate. However being charged without is $72.
So, when I got home, I did my own installation.
I fabricated 2 brackets (1/8 x 3/4 stock) with 3 bends in each. The bracket feeds through the lower opening of the upper grille. There are 3 bends in each, 3 holes in each.
Behind the grille in the center area are twin horns, each mounted with a fixed bolt. I removed the nuts and mounted my brackets on the bolts.
The other ends of the brackets fit and mount to the back of the license bracket.
NOTHING TOUCHES THE VEHICLE EXCEPT AT THE HORN MOUNT.
I did cut a piece of foam to fit the back lower area of the license bracket to make sure wind driving pressure does not push it back. I have about 1/2" clearances.
The fabricated brackets are assembled to the license bracket first, then fed through the grille openings, and mounted to the horn bolts.

In a year (I hope) I'll remove it. Meanwhile I'm legal.