To "have someone's head on a plate" is a set expression meaning to punish someone severely. The word "head" is sometimes replaced with other nouns, but "have your plate on a plate" appears to make no sense. It seems to be a misprint in which the word "plate" was accidentally repeated in place of another word.
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GPYIt seems to be a misprint in which the word "plate" was accidentally repeated in place of another word.I guess it could also be an idiosyncrasy of that particular speaker. I can find no other relevant Google hits for such an expression.