Only Show In Post Ads in one or more categories

So I want to use this plugin to intersperse ads inside the post content, but I only need it to do it on posts in certain categories. I see there is a way to tie certain ads to certain categories, but I don't see a way to enable it only on a certain category.

There is a meta field to turn it off on a post by post basis, but with over 5,000 posts, that's not a chore I want to do. There should be a way to only enable on certain categories. If it's not in that category, it won't show up. As it is now, it's showing on every post, with no restrictions.

How can I use this plugin to only do the in post ads on posts in certain categories?