When you export the ProductReview Ad reports there are several headers that refer to different placements. Here are visual examples of what each column is referring to:
Header (subtitle link below the listing title): Redirects to the landing page
Leaderboard (near the top and bottom of the listing page): Redirects to either the listing page or the landing page
Mobile (stick placement at the bottom of the listing page): Redirects to either the listing page or the landing page
Sidebar (sticky on the right side of the listing page): Redirects to either the listing page or the landing page (if clicking on the 'Official Website' button)
Reviews (between review content): Redirects to either the listing page or the landing page
Questions (between questions): Redirects to either the listing page or the landing page
Search (pinned as the first placement on the category page): Redirects to the listing page