For installation on same server as Nextcloud should I set “Allow list for WOPI requests” to server IP/localhost?

I have Collabora installed and integrated with Nextcloud on the same server, both installed natively, not via docker or similar. In the Nextcloud interface, there is a setting “Allow list for WOPI requests”. I assume this can improve security, but what should I set it to on my setup, e.g. localhost?