Apex domains cannot have CNAME records.
Question and response
Question
dig collophon.com. NS
Answer
collophon.com. 5 NS ns2.collophon.com.
collophon.com. 5 NS ns1.collophon.com.
Authority
The response has no authority records.
Additional
ns1.collophon.com. 5 A 51.15.20.22
ns2.collophon.com. 5 A 184.154.178.178
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0