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go to an auto parts store like NAPA and get a couple of those plastic caps that has the piece on the back that you push into hole and it has fins on it to keep it from backing out (only way I know how to describe it).
Also, on the previous generation if you had the tailgate step, they use those same caps I described above on the plastic tailgate cover. You could go to your dealer and ask them for a couple of those which should work for you as well.
A lot of people are running small 12" or so light bars in there. I definitely would if my state didn't have the front plate requirement.
hijack alert.... I was able to install a 7 inch single stack LED bar behind the plate but high enough that it illuminate out above the plate. Not a ton of light but it helps.