Apex domains cannot have CNAME records.
Question and response
Question
dig tmg.si. NS
Answer
tmg.si. 5 NS cdns2.controlpanel.si.
tmg.si. 5 NS cdns1.controlpanel.si.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0