DAVx⁵ has been successfully tested with cPanel.
cPanel is a web-based control panel for site management. It provides CalDAV and CardDAV integration.
Base URL:/rpc.php/ (e.g. http(s)://server.example:2080/rpc.php/)
For more information, see cPanel Knowlegde Base: How to Set Up Calendars and Contacts.
Last updated: 30 Dec 2018