AdRotate allows you to place advertising banners pretty much anywhere on your site.
https://wordpress.org/plugins/adrotate/
Widgets · WordPress Plugins
Get access to data on 135,382 websites that are AdRotate for WordPress Customers. We know of 45,223 live websites using AdRotate for WordPress and an additional 90,159 sites that used AdRotate for WordPress historically and 23,525 websites in the United States.
Get a list of 135,382 websites using AdRotate for WordPress which includes location information, hosting data, contact details, 88,294 currently live websites which includes 43,071 domains that redirect to sites in the list. 90,159 sites that used this technology previously and 23,525 websites in the United States currently using AdRotate for WordPress.