Surge does not allow mapping a 5-word proxy domain hostname successfully. For example;
196.247.50.35 can be accessed through two hostnames such as atlanta.us.socks.nordhold.net (5 words) and socks-us7.nordvpn.com (3 words). Thus;
Mapping: atlanta.us.socks.nordhold.net = 196.247.50.35 can not be parsed and not working
while
Mapping: socks-us7.nordvpn.com = 196.247.50.35 works.