Is there any implementation guide for the Google survey opt-in module or has anyone integrated it?
This is the Google integration guide. It requieres to update the <DOCTYPE> and to write code just before de closing body tag </BODY>
I'm not sure if this is possible with Tealium and if so how can I do it.
Thank you very much.
It sounds like a job for the Tealium Custom Container tag if you can't find an integration in the marketplace.
Start here for docs about the Custom Container tag. It's complex - read carefully!