The positioning of the JavaScript depends on whether you are using tag manager.

No Tag Manager

For no tag manager, place the tracking script in the <head> of the HTML. This will ensure the dynamic numbers switch across faster.

Google Tag Manager

In Google Tag Manager, configure a new tag of type Custom HTML Tag and paste the entire script, including the <script> tags, in the HTML field. Set the script to run on every page.

Other Tag Manager

For other tag managers, configure the tracking script to execute as soon as possible.