Apex domains cannot have CNAME records.
Question and response
Question
dig metrompls.com. NS
Answer
metrompls.com. 5 NS ns2.metrompls.com.
metrompls.com. 5 NS ns1.metrompls.com.
Authority
The response has no authority records.
Additional
ns1.metrompls.com. 5 A 179.63.192.2
ns2.metrompls.com. 5 A 179.63.192.3
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0