Apex domains cannot have CNAME records.
Question and response
Question
dig glipac.eu. NS
Answer
glipac.eu. 5 NS ns78.irondns.net.
glipac.eu. 5 NS ns76.irondns.net.
glipac.eu. 5 NS ns1.glipac.ch.
glipac.eu. 5 NS ns2.glipac.ch.
glipac.eu. 5 NS ns3.glipac.ch.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0