Set up my Pi-hole DNS Server in Oracle Cloud

I would like to make my Pi-hole DNS server hosted on Oracle Cloud work well, because I managed to make it work, the problem is that not very safely, because it only worked with the Source CIDR of on UDP and TCP ports 53 allowed in the Security List of the virtual network of my instance in the cloud and the option "Permit all origins" enabled in Pi-hole. I think a better option would be in place of in the Source CIDR I put the public IP of my home network, however it is a dynamic IP, that is, I would have to change it always. So I wanted a good and secure solution to these problems, so I could only allow specific devices on my DNS server, perhaps allowing some via MAC address as well.

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