Apex domains cannot have CNAME records.
Question and response
Question
dig 1-grid.com. NS
Answer
1-grid.com. 4 NS etta.ns.cloudflare.com.
1-grid.com. 4 NS ajay.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0