Thanks so much for responding, Tom. There are two questions I have about the approach you suggest.
First, I would need to place each ad two times, right? Once in the sidebar (tagged somehow to only show in non-mobile) and in the body of a specific post (tagged to only show in mobile). Is this correct?
Second, I’d have to manually place each ad into each post I want them to appear in, correct? We want the ads to appear on every page of the blog, and new posts are added all of the time, so this approach seems rather difficult. It could also result in the ads displaying multiple times on the homepage, since more than one show on the homepage.