By default Google AdSense display the anchor ads at the top of the page, to change it to the bottom of the page you can make use of the "overlays" configuration like below.
overlays: {bottom: true}Full Code Example
<script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=ca-pub-1234567891234567" crossorigin="anonymous"></script>
<script>
(adsbygoogle = window.adsbygoogle || []).push({
google_ad_client: "ca-pub-1234567891234567",
enable_page_level_ads: true,
overlays: {bottom: true}
});
</script>Do note that based on Google experiment, top anchor ads earn more than the one shown at the bottom of the page.
