If your site loads two Google Tag Manager containers, one is the container you added yourself and the other is the HomeRunner tag. You can choose which one runs in the Conversion Tracking module of the HomeRunner Toolkit hub. This is available in Toolkit version 3.192.x and later.
If you manage your own GTM container. In the Conversion Tracking module, switch the HomeRunner Tag toggle off and leave the GA4/GTM/Pixel ID fields empty. The HomeRunner container stops loading and your container stays active. The Toolkit pushes its events into the shared dataLayer, so your container can map them.
If you do not have your own container. Enter your GTM Container ID or GA4 Measurement ID in the same GA4/GTM/Pixel ID fields. Your tag replaces the HomeRunner tag.
Check the result. View the page source and confirm that exactly one GTM container ID appears.