I have a MikroTik RouterOS device that has some custom DNS settings and therefore I cannot change the DNS servers it provides to clients, which is a requirement to use UnoTelly or Unblockus. Instead I found the following article very helpful, it allows you to configure Conditional DNS forwarding for specific domains.

https://www.dalemacartney.com/2012/12/29/dns-conditional-forwarders-with-mikrotik-routeros/

This works well because I use MediaHint to swap back and forth for NetFlix US and Canada, but use only the US Amazon Prime.