Apex domains cannot have CNAME records.
Question and response
Question
dig dnzdns.com. NS
Answer
dnzdns.com. 4 NS ns2.dnzdns.com.
dnzdns.com. 4 NS ns1.dnzdns.com.
Authority
The response has no authority records.
Additional
ns1.dnzdns.com. 4 A 3.13.5.56
ns1.dnzdns.com. 4 A 3.132.188.189
ns1.dnzdns.com. 4 A 18.189.133.24
ns2.dnzdns.com. 4 A 3.23.227.207
ns2.dnzdns.com. 4 A 3.139.183.150
ns2.dnzdns.com. 4 A 18.190.44.139
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0