Apex domains cannot have CNAME records.
Question and response
Question
dig ee. NS
Answer
ee. 5 NS ee.eenet.ee.
ee. 5 NS ns.tld.ee.
ee. 5 NS ee.cert.ee.
ee. 5 NS e.tld.ee.
ee. 5 NS b.tld.ee.
Authority
The response has no authority records.
Additional
b.tld.ee. 170573 A 194.146.106.110
e.tld.ee. 169493 A 204.61.216.36
ee.cert.ee. 73082 A 46.226.142.147
ee.eenet.ee. 166207 A 193.40.132.5
ns.tld.ee. 167585 A 195.43.87.10
b.tld.ee. 170573 AAAA 2001:67c:1010:28:0:0:0:53
e.tld.ee. 169493 AAAA 2001:678:94:53:0:0:0:53
ee.cert.ee. 73082 AAAA 2a00:6a00:ad1:814:0:0:0:147
ee.eenet.ee. 166207 AAAA 2001:bb8:4001:0:0:0:0:53
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0