Apex domains cannot have CNAME records.
Question and response
Question
dig hopla.cloud. NS
Answer
hopla.cloud. 1 NS ns0-fr-east-2.pub.hopla.cloud.
hopla.cloud. 1 NS ns1-fr-east-2.pub.hopla.cloud.
Authority
The response has no authority records.
Additional
ns0-fr-east-2.pub.hopla.cloud. 1 A 185.116.104.100
ns1-fr-east-2.pub.hopla.cloud. 1 A 185.116.104.101
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0