Apex domains cannot have CNAME records.
Question and response
Question
dig ns2.m-wifo.com. NS
Answer
ns2.m-wifo.com. 5 NS nstwo.m-wifo.com.
ns2.m-wifo.com. 5 NS nsone.m-wifo.com.
Authority
The response has no authority records.
Additional
nsone.m-wifo.com. 5 A 202.51.96.18
nstwo.m-wifo.com. 5 A 202.51.104.7
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0