Apex domains cannot have CNAME records.
Question and response
Question
dig metafour.com. NS
Answer
metafour.com. 5 NS ns-975.awsdns-57.net.
metafour.com. 5 NS ns-1778.awsdns-30.co.uk.
metafour.com. 5 NS ns-100.awsdns-12.com.
metafour.com. 5 NS ns-1313.awsdns-36.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0