🚫No WordPress plugin needed to add tracking code to the header 👍

header-tracking-snippet.php

function header_tag_analytics() { ?>
<script async src="https://www.googletagmanager.com/gtag/js?id=UA-XXXXXXXXX-XX"></script>
<script>
  window.dataLayer = window.dataLayer || [];
  function gtag(){dataLayer.push(arguments);}
  gtag('js', new Date());

  gtag('config', 'UA-XXXXXXXX-XX');
</script>
// Add your Tweeder scripts Adroll scripts Facebook scripts BounceX scripts Optimizely scripts or whatever needs to be in the head

<?php }
add_action( 'wp_head', 'header_tag_analytics', 10 );