Apex domains cannot have CNAME records.
Question and response
Question
dig ovh.ca. NS
Answer
ovh.ca. 2 NS dns19.ovh.net.
ovh.ca. 2 NS ns19.ovh.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0