Ok sorry I wasn't clear on what part you were goung to put it in.

I did mine in my Accord but I cut it a little bit oversized then force fit it into the lower grill. Its not an easy task at all and gutter guard tends to be too narrow to fill the opening in one piece so I ended up zip tying two pices together and clipping the extra plasic off the zip ties and made sure that the zip ties lined up behind the center bar on the lower grill.

To attach it I merely forced the mesh in and it has held just fine but if you want to I would say take the bumper off and attach it with a couple drops of hot glue in key locations where it won't be seen.