How to correctly install tracking codes for web analytics systems on a site managed by Bitrix, if there are 3 sites on one template, 3 domains?

Question

Google Analytics

It is necessary to have independent tracking for each domain, it is desirable to wrap everything in a Google tag manager.

Answer 1

If Bitrix is ​​one and there are 3 sites, and everything is on one template, copy the template 2 times, get 3 templates, name them by site names, apply them according to the condition - if the domain is 1, then template 1, domain 2 - template 2. And that's it.
Next, put the GTM code in the body of each template, having previously created 2 containers for each site, and in Google Analytics you create 3 resources, each will have its own tid (UA-xxx).