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 687,788 websites DuracellTomi Google Tag Manager for WordPress Customers. We know of 288,632 live websites using DuracellTomi Google Tag Manager for WordPress and an additional 399,156 sites that used DuracellTomi Google Tag Manager for WordPress historically and 81,437 websites in the United States.
Get a list of 687,788 websites using DuracellTomi Google Tag Manager for WordPress which includes location information, hosting data, contact details, 288,632 currently live websites and an additional 445,981 domains that redirect to sites in this list. 399,156 sites that used this technology previouslyand 81,437 websites in the United States currently using DuracellTomi Google Tag Manager for WordPress.
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