Apex domains cannot have CNAME records.
Question and response
Question
dig housetag.org. NS
Answer
housetag.org. 5 NS ns-1694.awsdns-19.co.uk.
housetag.org. 5 NS ns-622.awsdns-13.net.
housetag.org. 5 NS ns-995.awsdns-60.net.
housetag.org. 5 NS ns-1221.awsdns-24.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0