Apex domains cannot have CNAME records.
Question and response
Question
dig domainhotelli.fi. NS
Answer
domainhotelli.fi. 1 NS ns3.domainhotelli.com.
domainhotelli.fi. 1 NS ns2.domainhotelli.fi.
domainhotelli.fi. 1 NS ns1.domainhotelli.fi.
Authority
The response has no authority records.
Additional
ns1.domainhotelli.fi. 1 A 31.217.196.245
ns2.domainhotelli.fi. 1 A 35.243.183.207
ns3.domainhotelli.com. 1 A 35.204.139.44
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0