Apex domains cannot have CNAME records.
Question and response
Question
dig bpldns.com. NS
Answer
bpldns.com. 3 NS ns-2015.awsdns-59.co.uk.
bpldns.com. 3 NS ns-625.awsdns-14.net.
bpldns.com. 3 NS ns-344.awsdns-43.com.
bpldns.com. 3 NS ns-1091.awsdns-08.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0