A reliable AdSense plugin. Does it exist? [closed]

I’ve tried a bunch of AdSense plugins but I can’t seem to make any work. Can someone recommend something that is known to work?

My requirements are simple: display an ad under the header.

If your requirements end at “display an ad under the header” then just open up your theme’s header.php file and paste your adsense code there directly and avoid using a plugin all together.