XenForo’s default style provides 19 ad locations. Here is the visual guide to how each one of them is placed.
Hooks
A Visual Guide To XenForo Hooks
The complete visual guide to the position of each XenForo hook for header, footer as well as the forum_list, forum_view, thread_view and member_view pages
What are Hooks in XenForo Templates?
XenForo hooks are code snippets inside XenForo templates to execute any code in PHP via a plugin or template_hook event listener