Typically, you have the option of automatic configuration via DHCP or manual config. In the manual config, you should be able to configure at least two. You don't have to use the MTS server, if you don't want to. I stopped using the Rogers DNS quite a while ago, because they started redirecting broken URLs, instead of giving an error as they're supposed to.
These are the ones I use on my firewall:
The first two are IPv6 addresses, though any DNS server should be able to provide both IPv4 & IPv6 addresses.
I haven't lost my mind. It's around here...somewhere...