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(Not to detract from the point here, but using a thank you page as a form submit trigger is not reco’d. Push something from the datalayer, like event = form_submit as your custom event, then formname in the DLV is whatever the form name is.)
To echo some of the below – because I work in a similar environment where we duplicate things across sites with little to no variance – I found that creating yoru “perfect” gtm container as a standalone is great, then jsut export the container .json file. you should just need to create variables for the analytics/pixels, then on a per-site basis, config the variable value.
