ConvertFlow's area snippets let you target embedded campaigns to predefined areas on your website, using the targeting system.

Installing areas on a WordPress plugin can be made easier by using the widgets under Appearance > Widgets. Using the custom HTML widget, you can easily add the area snippet to your website to any widget your WordPress theme enables.

There is also a simple plugin that makes it easy to add any HTML to the top & bottom of WordPress posts and pages.

https://wordpress.org/plugins/pryc-wp-add-custom-content-to-bottom-of-post/

Using this, you can add areas for your campaigns to display before and after your WordPress posts.