The etracker tracking code can be played out via the Google Tag Manager (GTM). For basic integration, you can find instructions here: https://www.etracker.com/en/docs/integration-setup-2/tracking-code-sdks/tracking-code-integration/function-purpose/
But remember that you must obtain the consent of your users before using the GTM in order to comply with data protection regulations. This will also make invalid etracker Analytics‘ freedom of consent. We therefore recommend integrating etracker using the etracker standard tag.