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Depends on where the grill block goes, and how much wind force it gets. The one I use on the Insight just sits in place. (Though magnets wouldn't be much use on an aluminium body anyway.) But if they will hold e.g. real estate advertising signs on doors, they should be ok to say hold in a grille block.
The refrigerator magnets aren't all that weak, since you can have a lot of area. Ever try to pull one straight off, as opposed to peeling it?
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