Google Tag Manager
We don't typically recommend GTM because a lot of ad-blockers block it (since it's Google). But if the convenience outweighs the ad-blocking, you can easily drop Fathom in using the code below (filling in the Site ID with your own, of course).
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<script> var script = document.createElement('script'); script.id = 'fathom'; script.dataset.site = 'YOUR-SITE-ID'; script.src = "https://cdn.usefathom.com/script.js"; document.getElementsByTagName('head').appendChild(script); </script>