Yes, server-side GTM is fully supported by Google Analytics 4 GA4 with GTM support for Magento 2. This allows merchants to offload event processing to the server, improving data accuracy, reducing client-side data loss due to ad blockers, and offering better control over user data privacy. The setup supports both web and server-side containers simultaneously, making the Magento 2 store more resilient and future-proof.

Read this How to Setup Magento 2 GA4 (Google Analytics 4) with GTM guide to setup this extension.

Here are the few more resource to help you get most out of this Magento 2 GA4 with GTM Support Extension.

• How to Add Google Analytics 4 (GA4) with GTM in Magento 2
• How to Use GA4 with GTM Extension for eCommerce store
• How to Add Google Analytics in Magento 2
• How to Add Google Tag Manager (GTM) to Magento 2