Apex domains cannot have CNAME records.
Question and response
Question
dig hosttech.eu. NS
Answer
hosttech.eu. 5 NS ns2.hosttech.eu.
hosttech.eu. 5 NS ns3.hosttech.eu.
hosttech.eu. 5 NS ns1.hosttech.eu.
Authority
The response has no authority records.
Additional
ns1.hosttech.eu. 5 A 82.220.34.231
ns2.hosttech.eu. 5 A 5.79.97.178
ns3.hosttech.eu. 5 A 94.130.74.45
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0