Apex domains cannot have CNAME records.
Question and response
Question
dig vps.ovh.ca. NS
Answer
vps.ovh.ca. 5 NS dns10.ovh.ca.
vps.ovh.ca. 5 NS ns10.ovh.ca.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0