I put my galvanized mesh on the inside of the grille using black zip ties. I got the idea from Versa Madness. Here's his look with pictures:
zerothread?id=331470
Doesn't make the car look different but I was looking for bug and road debris protection for the radiator, not appearance. If all you're looking for is protection, you could mount yours the same way.
If you are looking to mount it for the "look" you can use the zip ties and mount the mesh to the outside, but I don't know that the edges will look very refined.