Apex domains cannot have CNAME records.
Question and response
Question
dig 2e2.com. NS
Answer
2e2.com. 5 NS auth1.dns.gxn.net.
2e2.com. 5 NS auth3.dns.gxn.net.
2e2.com. 5 NS auth2.dns.gxn.net.
2e2.com. 5 NS auth4.dns.gxn.net.
Authority
The response has no authority records.
Additional
auth1.dns.gxn.net. 5 A 195.224.255.2
auth2.dns.gxn.net. 5 A 195.224.255.6
auth3.dns.gxn.net. 5 A 62.44.64.110
auth4.dns.gxn.net. 5 A 195.224.255.94
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0