Domains (Tagging Server URLs)

Good morning everyone.

Although I read https://stape.io/it/blog/como-aggiungere-dominio-personalizzato-al-contanitore-del-server-di-google-tag-manager

I would like to have a confirmation. Must the Domains (Tagging Server URLs) be the same as the mysite.it server or would it be better to use sgtm.mysite.it? (3 level)

You need to use sgtm.mysite.it as your tagging url

Perfect for the clarification.