Apex domains cannot have CNAME records.
Question and response
Question
dig alisatm.com. NS
Answer
alisatm.com. 5 NS hydrogen.ns.hetzner.com.
alisatm.com. 5 NS oxygen.ns.hetzner.com.
alisatm.com. 5 NS helium.ns.hetzner.de.
Authority
The response has no authority records.
Additional
helium.ns.hetzner.de. 4 A 193.47.99.5
helium.ns.hetzner.de. 4 AAAA 2001:67c:192c:0:0:0:add:5
oxygen.ns.hetzner.com. 4 AAAA 2a01:4f8:0:1:0:0:add:2992
hydrogen.ns.hetzner.com. 4 AAAA 2a01:4f8:0:1:0:0:add:1098
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0