I used self tapping screws. Bumper was already slightly cracked underneath so it helps hold it all together. And the holes are quite tiny too. Has held up to about 3000 miles of driving, with scraping and all (only 2.5" of ground clearance).
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2013 Toyota Prius C 2 (my car)
2015 Mazda 3 iTouring Hatchback w/ Tech Package (wife's car)
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