Question
Does it only work via Google tag manager?
Answer
Installation
* PageTest.AI does not require Google Tag Manager — that’s just one option.
* You can also install it by pasting a single script directly into the website header.
* There is also a WordPress Plugin, to make WordPress setup a breeze.
* If you’re managing client sites, you can either add the script yourself or ask them to. No need for them to set up their own account unless you want them to.