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Don't put them there.
Your under hood is VERY hot, and decals will either smolder and attach to your hood and then melt, or just fall off from all the hot air and dust. The material the factory stickers are made from is not just some sticker stuff, its treated for heat and dust.
I have all sorts of stickers and vinyl wrap under my hood and never had a problem...
Yeah they do that all the time on the show american restoration.