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 707,944 websites that are DuracellTomi Google Tag Manager for WordPress Customers. We know of 266,815 live websites using DuracellTomi Google Tag Manager for WordPress and an additional 441,129 sites that used DuracellTomi Google Tag Manager for WordPress historically and 74,456 websites in the United States.
Get a list of 707,944 websites using DuracellTomi Google Tag Manager for WordPress which includes location information, hosting data, contact details, 266,815 currently live websites and an additional 401,520 domains that redirect to sites in this list. 441,129 sites that used this technology previouslyand 74,456 websites in the United States currently using DuracellTomi Google Tag Manager for WordPress.
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