Apex domains cannot have CNAME records.
Question and response
Question
dig satmetrix.com. NS
Answer
satmetrix.com. 5 NS ns-463.awsdns-57.com.
satmetrix.com. 5 NS ns-1088.awsdns-08.org.
satmetrix.com. 5 NS ns-1013.awsdns-62.net.
satmetrix.com. 5 NS ns-2011.awsdns-59.co.uk.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0