Apex domains cannot have CNAME records.
Question and response
Question
dig puresafety.com. NS
Answer
puresafety.com. 4 NS ns-701.awsdns-23.net.
puresafety.com. 4 NS ns-1693.awsdns-19.co.uk.
puresafety.com. 4 NS ns-503.awsdns-62.com.
puresafety.com. 4 NS ns-1076.awsdns-06.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0