Display the ads that fit.
The good news: this plugin works. The bad news: the execution is pretty bad.
The main problem is that the plugin offers only a widget to insert responsive ads. So, unless you have a widget area (most likely a sidebar or footer) that you want to contain responsive ads, it's not much use.
It's a PITA if you want a 728x90 banner ad to appear on a desktop site, for example, since that type of banner wouldn't normally be included in a sidebar/widget area. So a new widget area needs to be added to the theme functions/templates just so the ad can appear.
If the developer was prepared to make some relatively minor changes this could be a far more useful plugin. For example:
That should do it.
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