header-footer-code-manager (HFCM)

https://wordpress.org/plugins/header-footer-code-manager/

Works great - centralized place to manage all scripts / conversion events.

- Use this to install GTM in header and 'footer' (ideal is body, but that is not possible with this plugin site wide) - tested working with Oxygen (no theme)

- Fire GA via GTM (inbuilt tag, just create a new variable)