I must add consent mode code or not?

Hi, I need to use consent mode describer here https://www.iubenda.com/en/help/27137-google-consent-mode I need to add this code

<script>
    // Initialize the data layer for Google Tag Manager (this should mandatorily be done before the Cookie Solution is loaded)
    window.dataLayer = window.dataLayer || [];
    function gtag() {
        dataLayer.push(arguments);
    }
    // Default consent mode is "denied" for both ads and analytics, but delay for 2 seconds until the Cookie Solution is loaded
    gtag("consent", "default", {
        ad_storage: "denied",
        analytics_storage: "denied",
        wait_for_update: 2000 // milliseconds
    });
    // Further redact your ads data (optional)
    gtag("set", "ads_data_redaction", true);
</script>

but I do not understand if your plugin write this code or I need to add this code on functions.php using ad hook?

thanks