How to integrate GTM with a third party managed DNS service

Don't forget the related GTM A records that will need to be in place to support those NS records, but YES, you are correct in your assumption of how to get the query to the GTM device. This can be done one of two ways, per record, or for an entire sub-domain. Based on your processes and policies, one may be better than the other.

For instance(s): If people can use whatever name you provide, then creating a completely delegated sub-domain can minimize your need to interact with the 3rd party. But, if you have to use the names/domains established, like vs. new sub-domain), you would still have to engage them for the CNAME that gets the client from to .

If you were to choose a per record strategy, you would just need to add the NS entries as you noted above. Assuming the A records for the GTM are already in place on the DNS.

Once again, this would be based on how you prefer to operate. Both methods will work fine.

Hope this helps!