Google Analytics 4 & Google Ads Tracking (Gtag): General questions
No, the add-on is not necessary, as support for Consent Mode V2 is independent of the Shopware Consent Manager.
With the extension, only one Adwords ID and one Analytics ID can be used at a time. It is not possible to use multiple snippets at the same time, for example for UA and GA4.
For the Google Analytics Property ID, you must enter the Measurement ID if you want to use GA-4. You can find this in the plugin installation instructions. For the Google AdWords ID, you can find it in the snippet when you create or edit a conversion in AdWords.
The message "A tag read consent before a default was set" means that no default was set for Constent Mode V2. We have deliberately implemented this as we only set Constent Mode V2 after confirmation by the user. This is the correct procedure from a GDPR perspective.
It can take up to 48 hours for data to be processed and displayed by Google. If no data can be seen after 48 hours, the IDs should be checked again in the extension settings.
Google offers for the Gtag the tagassistant on. This can be used to check whether the Gtag has been integrated correctly and which events are fired for certain actions.