Add third party Analytics to template footer not working

I need to add some javascript code provided by a third party, however, if I add it to templates/mytemplate/common/tpl_footer.php, and I check out the source code afterwards, then the javascript code, is not where it supposed to be, which is right before the </body> tag, but somewhere in the middle of the page, so their site(script provider) doesn't see it ... Do I have to edit another template file to be able to add the code right next to the closing body tag?

Get the google analytics 3rd party module and install it
In the free software addon section

It's not Google Analytics! (It's a HubSpot plugin), I already have that(GA) installed and working, I need to add code to the same place ... just don't know where the code is added, I think due to the template structure it has to be in some template, but couldn't remember which...