Apex domains cannot have CNAME records.
Question and response
Question
dig freednsserver.net. NS
Answer
freednsserver.net. 5 NS ns2.freednsserver.net.
freednsserver.net. 5 NS ns3.freednsserver.net.
freednsserver.net. 5 NS ns1.freednsserver.net.
Authority
The response has no authority records.
Additional
ns1.freednsserver.net. 5 A 192.241.253.185
ns2.freednsserver.net. 5 A 95.85.22.186
ns3.freednsserver.net. 5 A 139.59.194.51
ns1.freednsserver.net. 5 AAAA 2604:a880:0:1010:0:0:12ec:3001
ns2.freednsserver.net. 5 AAAA 2a03:b0c0:0:1010:0:0:2d:6001
ns3.freednsserver.net. 5 AAAA 2400:6180:0:d0:0:0:1b2:9001
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0