Thanks for the clarification.
As CNAME performs as fast as expected, just moving from apex to
www subdomain would be a good option.
NS1’s linked record sounds great, and I tried it but it seems like not working.
I configured the record on NS1 like so:
and added a domain alias on Netlify.
But Netlify doesn’t recognize the DNS record and always says “Check DNS configuration”, even after 1 hour:
host -v top-test.inkdrop.app
Host top-test.inkdrop.app not found: 2(SERVFAIL)
Received 38 bytes from 172.20.10.1#53 in 42 ms