Apex domains cannot have CNAME records.
Question and response
Question
dig metadot.com. NS
Answer
metadot.com. 5 NS ns-844.awsdns-41.net.
metadot.com. 5 NS ns-1608.awsdns-09.co.uk.
metadot.com. 5 NS ns-236.awsdns-29.com.
metadot.com. 5 NS ns-1115.awsdns-11.org.
Authority
The response has no authority records.
Additional
ns-844.awsdns-41.net. 3 A 205.251.195.76
ns-1115.awsdns-11.org. 3 A 205.251.196.91
ns-1608.awsdns-09.co.uk. 3 A 205.251.198.72
ns-236.awsdns-29.com. 3 AAAA 2600:9000:5300:ec00:0:0:0:1
ns-844.awsdns-41.net. 3 AAAA 2600:9000:5303:4c00:0:0:0:1
ns-1115.awsdns-11.org. 3 AAAA 2600:9000:5304:5b00:0:0:0:1
ns-1608.awsdns-09.co.uk. 3 AAAA 2600:9000:5306:4800:0:0:0:1
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0