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 644,903 websites DuracellTomi Google Tag Manager for WordPress Customers. We know of 294,078 live websites using DuracellTomi Google Tag Manager for WordPress and an additional 350,825 sites that used DuracellTomi Google Tag Manager for WordPress historically and 86,308 websites in the United States.
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Get a list of 644,903 websites using DuracellTomi Google Tag Manager for WordPress which includes location information, hosting data, contact details, 294,078 currently live websites and an additional 449,148 domains that redirect to sites in this list. 350,825 sites that used this technology previouslyand 86,308 websites in the United States currently using DuracellTomi Google Tag Manager for WordPress.
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