You should do whatever you think would be most useful to your site's visitors.
Personally, if I was visiting a site, it would never occur to me to visit an "accreditation" page - nor would I have any reason to do so. If I happened to see an accreditation logo on one of the important pages, it might register with me, and it might help create a good impression. But I wouldn't go out of my way to look for it.
Ultimately, accreditation is not a good selling tool. It's an "about us" thing, not a benefit to the customer.