It seems the ads can be placed in widgets, or one can manually edit their template files and put them in.
Is there no place where it will call hook to place it before or after posts or other areas? Does that need to be done manually?
It would seem reasonable for a few of those hooks to be programmed in the plugin. That way when you open Manage Ads or Manage Groups, right after the section that says "Select the group(s) this ad belongs to (Optional)" or "Choose the ads to use in this group" there would be checkboxes such as
"Show this Ad/Group after posts", "before posts", etc. Or where ever a hook might be reasonable.