Google’s John Mueller said on Twitter that it is ideal to implement your structured data on the page itself and not use Google Tag Manager to execute your structured data. He said the reason is that it makes it “straight-forward & usually easier to monitor/maintain.”

John added that utilizing Google Tag Manager is “great for trying SD out & fine-tuning it, but on the page, SD is much more straight-forward & usually easier to monitor/maintain.”

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Source: Twitter