If you are using WCM Core Components, you can overlay the basepage component, specifically this script, http://localhost:4502/crx/de/index.jsp#/apps/core/wcm/components/page/v2/page/footer.html.
The outcome of your HTML is expected to look like:
I am sure most of the organization would use the Tag Management tools to handle these kind of requests. It is best to load these kind of requests through Tag Management tools (Adobe Launch (DTM), GTM, Taleo..etc). You can easily deploy without any code deployments and have more control over.