We have a multisite installation and would like to have multiple custom domains to be associated with one site. For example, www.example.com, prod.example.com and cdn.example.com should all point to the same site. What would be the best approach to achieve that? Based on what I see WP only allows one Site URL per site.

Also, just to put some boundaries around that question, because it is a multisite installation, there could also be another site with a different set of custom domains, i.e., www.example2.com, prod.example2.com and cdn.example2.com.

Redirects will not be a solution, since that is a default way how WordPress handles such cases and that doesn’t work for us.

It’s good if there is a plugin for that, but more than happy to consider a code only solution with something going into wp-config.php file.