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