Apex domains cannot have CNAME records.
Question and response
Question
dig firstfind.net. NS
Answer
firstfind.net. 5 NS ns1.yoursrs.com.
firstfind.net. 5 NS ns2.yoursrs.com.
Authority
The response has no authority records.
Additional
ns1.yoursrs.com. 1 A 104.47.151.178
ns2.yoursrs.com. 1 A 20.79.93.42
ns1.yoursrs.com. 1 AAAA 2603:1020:200:0:0:0:682f:a758
ns2.yoursrs.com. 1 AAAA 2603:1020:c01:4:0:0:0:8
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0