In any case, I agree with you they should just be a part of the search results page. Where they should appear is actually an interesting question we are exploring right now, and are finding the placement is very query-dependent (middle, bottom, right, top), and maybe should be customizable in any case.
We have a feedback box next to every answer where you can provide that feedback, which we read. We try to avoid user-generated content in general as sources right now. And current customization can control how often they appear (including never).