Apex domains cannot have CNAME records.
Question and response
Question
dig ip-5-196-67.eu. NS
Answer
ip-5-196-67.eu. 3 NS ns109.ovh.net.
ip-5-196-67.eu. 3 NS dns109.ovh.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0