Apex domains cannot have CNAME records.
Question and response
Question
dig register.to. NS
Answer
register.to. 2 NS norah.ns.cloudflare.com.
register.to. 2 NS aldo.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0