You can take a Smartlink from your Monetag account dashboard. (Sites→ Add site →Add zone→Direct link (Direct Ads).
You choose the area within which to put your Smartlink. It can be any particular element on your website (an active button, text, a picture, etc.).
To learn more about this type of ad and how to use it, please read the following article:
https://monetag.com/monetize-any-traffic-with-direct-link/