Adam Ainsworth

Does exactly what it says on the tin, if you want your Featured Image to be inserted before the content in your pages or posts, and your theme doesn’t support this, then this is the plugin for you.
No styling is done by default, this will be added in a future version.

Thumbnail Before Content

This is a simple plugin that automatically inserts the post thumbnail (featured image) before the post content.

Imtiaz Shamim

Before After plugin is designed to give you accessibility with your content’s before and after section. You can use the before section or after section or both at same time. You can select if it will work only for single blog page or only for pages or both. It will not work for shop page or portfolio or other custom post type. 
You can use tinymce and linkable image so you can use this plugin for advertisement also. You have also custom design option too.
Main Features
<ul>
<li>Controll before/after section</li>
<li>Responsive</li>
<li>Linkable image banner</li>
<li>Image alignment with size control</li>
<li>Box design for text message</li>
<li>Design control for text message</li>
<li>Lightweight</li>
<li>Easy installation.</li>
</ul>

Before After Content

This plugin is for quickly adding text or image before or after content.

Thumbnail Before Content vs Before After Content