You can check using this test, it gives various info about your current DNS, including DNSSEC support.Hey do you know if Fortinet supports DNSSEC
Pi-Hole is designed to be run in a VM or on a Raspberry Pi, it's not designed to run on a Windows PC, it's a DNS server on your network, not an endpoint DNS server.
Thanks for the link. I wonder, why dns.watch does not support encryption yet. I always considered it top notch.