The instructions say to put the code before the </body> tag.

At the bottom of /includes/templates/[your_template]/common/tpl_main_page.php
Copy and paste the following lines of code (found below) just before the </body> tag:

This was the case a few years ago but these are the current instructions.
Copy the following code, then paste it onto every page you want to track immediately before the closing </head> tag.

I've installed per the instructions but wondered about the discrepancy.
Thanks