Apex domains cannot have CNAME records.
Question and response
Question
dig miniserver.com. NS
Answer
miniserver.com. 5 NS ns1.memset.com.
miniserver.com. 5 NS ns2.memset.com.
miniserver.com. 5 NS ns3.memset.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0