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 709,515 websites that are DuracellTomi Google Tag Manager for WordPress Customers. We know of 269,788 live websites using DuracellTomi Google Tag Manager for WordPress and an additional 439,727 sites that used DuracellTomi Google Tag Manager for WordPress historically and 75,057 websites in the United States.
Get a list of 709,515 websites using DuracellTomi Google Tag Manager for WordPress which includes location information, hosting data, contact details, 269,788 currently live websites and an additional 407,883 domains that redirect to sites in this list. 439,727 sites that used this technology previouslyand 75,057 websites in the United States currently using DuracellTomi Google Tag Manager for WordPress.
Countries
Financial
Group
Region