Apex domains cannot have CNAME records.
Question and response
Question
dig kays.com. NS
Answer
kays.com. 5 NS love.ns.cloudflare.com.
kays.com. 5 NS tate.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0