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The triangle fold is the way to go. Just lay the napkin to the left of the setting.
a company i worked for said you shouldn't because the guest will expect that you have given then a fresh, clean napkin and when they see it's their same old food encrusted one they might complain.
we are talking linen napkins, aren't we?
Rule house always, proffesional always but think for save the money depends where you work:)