Apex domains cannot have CNAME records.
Question and response
Question
dig rimuhosting.com. NS
Answer
rimuhosting.com. 5 NS ns1.rimuhosting.com.
rimuhosting.com. 5 NS ns4.rimuhosting.com.
rimuhosting.com. 5 NS ns2.rimuhosting.com.
Authority
The response has no authority records.
Additional
ns1.rimuhosting.com. 5 A 66.199.228.130
ns2.rimuhosting.com. 5 A 206.123.113.132
ns4.rimuhosting.com. 5 A 94.76.200.49
ns2.rimuhosting.com. 5 AAAA 2605:7700:0:200:0:0:0:2
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0