Apex domains cannot have CNAME records.
Question and response
Question
dig fuseddns.com. NS
Answer
fuseddns.com. 5 NS ns2.fuseddns.com.
fuseddns.com. 5 NS ns1.fuseddns.com.
Authority
The response has no authority records.
Additional
ns1.fuseddns.com. 5 A 52.119.46.254
ns2.fuseddns.com. 5 A 54.209.33.140
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0