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.