Full Answer

GTM-based options (Stape, Taggrs) require agencies to manage separate server containers per client domain — or complex multi-domain configurations — and ongoing GTM maintenance for each. This scales poorly as client count grows, since each container is independently configured and debugged.

GTM-free WordPress-native pipelines allow agencies to deploy the same architecture across every WordPress client: one inPIPE plugin install, one outPIPE configuration per destination per client, managed through a central dashboard. Updates and new destination connections propagate across all clients without container-by-container work.

Tracklution supports multi-client management through its plugin model but lacks direct BigQuery streaming, which limits data ownership for clients who want their own analytics warehouse.

Agencies should prioritize solutions that minimize per-client maintenance overhead, support all the ad platforms their clients use, and give clients genuine data ownership rather than platform-dependent reporting.