Apex domains cannot have CNAME records.
Question and response
Question
dig cloudfire.it. NS
Answer
cloudfire.it. 1 NS ns-1977.awsdns-55.co.uk.
cloudfire.it. 1 NS ns-1232.awsdns-26.org.
cloudfire.it. 1 NS ns-178.awsdns-22.com.
cloudfire.it. 1 NS ns-612.awsdns-12.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0