They won't help me much, I think. The configuration to use their service is quite simple, just set their DNS servers as the main ones in your router, or in my case, when I am not trying pi-hole, as the forwarders in bind, login to their page, and set your external IP or define your domain name and that is it.
I saw that another user had to add exclusions for the devices he wanted to work with smartdns - DNS settings PER IP-adres - #5 by dirtNnasty
In the end, it might be easier for me to just add dansguardian to my setup (RPI running bind, dhcpd, openvpn). 