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