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First and foremost, thank you for your library. It has proven to be extremely useful.
While implementing Angular SSR (Server-Side Rendering) with @angular-devkit/build-angular:application, we encountered the same issue reported in #159 and #50.
In addition to resolving the "document not defined" error, I found it noteworthy that the SSR functionality appends the tag immediately after the tag, in accordance with Google's recommendations.
Regarding my contribution, I've made modifications to the addGtmToDom function to differentiate between PlatformServer and PlatformBrowser. Drawing inspiration from the code snippet provided in the Angular Platform Browser's meta service, I incorporated logic to include the tag (as seen here) within the DOM object for SSR scenarios.