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since the grill block is being acted on from the front, effectively adding force to the magnet, you might be ok. the fact that your bumper could be plastic is overcome by having an adhesive side on the magnet. If you make it out of coroplast or something just adhere the magnet on it with the adhesive (most refrigerator magnets will stick to each other in either direction), if that doesn't work, just attach a couple light washers that will stick to the magnet. Try to design your grill block to keep it from coming lose and hitting your windshield (or someone else's).
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