Apex domains cannot have CNAME records.
Question and response
Question
dig prewise.fi. NS
Answer
prewise.fi. 5 NS ns01.prewise.com.
prewise.fi. 5 NS ns2.prewise.com.
Authority
The response has no authority records.
Additional
ns2.prewise.com. 5 A 185.87.245.11
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0