This plugin places the GTM container code snippets onto your wordpress website so that you do not need to add this manually.
https://wordpress.org/plugins/duracelltomi-google-tag-manager/
Widgets · WordPress Plugins
Get access to data on 706,644 websites that are DuracellTomi Google Tag Manager for WordPress Customers. We know of 265,872 live websites using DuracellTomi Google Tag Manager for WordPress and an additional 440,772 sites that used DuracellTomi Google Tag Manager for WordPress historically and 74,735 websites in the United States.
Get a list of 706,644 websites using DuracellTomi Google Tag Manager for WordPress which includes location information, hosting data, contact details, 265,872 currently live websites and an additional 412,618 domains that redirect to sites in this list. 440,772 sites that used this technology previouslyand 74,735 websites in the United States currently using DuracellTomi Google Tag Manager for WordPress.
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