Apex domains cannot have CNAME records.
Question and response
Question
dig brennercom.it. NS
Answer
brennercom.it. 3 NS wanda.ns.cloudflare.com.
brennercom.it. 3 NS marek.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0