The only time I’ve used foil on the grates before was when I was at a lake and the grill was filthy. I wasn’t able to adequately burn off all the gunk so went the foil route. There’s no reason to do this if it’s your own grill and you maintain it.

Only as a hat.

Cook it low and slow the way God intended, and maybe cover it with foil after it’s done if you need to rest it longer than normal