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