Apex domains cannot have CNAME records.
Question and response
Question
dig securehostdns.com. NS
Answer
securehostdns.com. 5 NS ns1.securehostdns.com.
securehostdns.com. 5 NS ns2.securehostdns.com.
Authority
The response has no authority records.
Additional
ns1.securehostdns.com. 5 A 75.2.118.134
ns2.securehostdns.com. 5 A 13.248.158.180
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0