Apex domains cannot have CNAME records.
Question and response
Question
dig matrixtrackers.com. NS
Answer
matrixtrackers.com. 5 NS ns-1709.awsdns-21.co.uk.
matrixtrackers.com. 5 NS ns-998.awsdns-60.net.
matrixtrackers.com. 5 NS ns-384.awsdns-48.com.
matrixtrackers.com. 5 NS ns-499.awsdns-62.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0