Don't put them next to AP. One participant in a seminar several years ago said that the auditor had been there for over a year and was now engaged to one of her AP specialists. This is not a good thing.
Find someplace for them far away from other human beings. Make them comfortable and be professional, but isolate them. The objectives are that they don't get too comfortable, and that they don't have the opportunity to overhear conversations.
Don't let them near the lunchroom or the copier room. Provide them with coffee, pop and offer to get snacks for them. If they need copies made, do that for them. Anytime they venture beyond their assigned office, they should be escorted by the audit contact who is yelling, "Auditor's coming! Shut up!"