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There was an interesting thread not long ago about quality factors and follow up with the subject I was wondering:
Usually these are pages I use to place on a sitemap only. I don't find them relevant to place on a homepage for example, in addition it would be another link so I am not sure about benefits vs. risks.
Where would you reasonably expect to find it on your site? Thats where it needs to be.
Personaly I don't think it matters, from a functionality point of view, if you place it on the first page or site wide in the footer as long as its blocked via a "robots.txt" exclusion. Theres no need for the net to index it.