Apex domains cannot have CNAME records.
Question and response
Question
dig ZNS-53.NET. NS
Answer
ZNS-53.NET. 4 NS ns31.zns-53.com.
ZNS-53.NET. 4 NS ns11.zns-53.com.
ZNS-53.NET. 4 NS ns21.zns-53.net.
ZNS-53.NET. 4 NS ns41.zns-53.net.
Authority
The response has no authority records.
Additional
ns11.zns-53.com. 4 A 136.143.172.88
ns21.zns-53.net. 4 A 136.143.173.99
ns31.zns-53.com. 4 A 169.148.151.88
ns41.zns-53.net. 4 A 169.148.152.99
ns11.zns-53.com. 4 AAAA 2602:801:c00a:0:0:0:0:88
ns21.zns-53.net. 4 AAAA 2602:801:c00b:0:0:0:0:99
ns31.zns-53.com. 4 AAAA 2602:801:c00c:0:0:0:0:88
ns41.zns-53.net. 4 AAAA 2602:801:c00c:0:0:0:0:99
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0