Network settings - DNS

I use a static IP addresses for my gear, including ATEM Mini Extreme ISO and Hyperdeck Studio Mini. In the setup, the DNS settings are greyed out and are set to Google DNS and backup. I am running PiHole on a Raspberry Pi, so ideally would prefer to route via my own DNS. Has anyone been able to achieve this? As things stand, using Google DNS is allowed on my network so I am able to stream.

Has anyone found a solution to the quirk that the hyperdeck IP address has to be refreshed in the settings for it to be found on the network - I have to set it to an invalid address and then put the correct IP address in for the connection to be re-established.