AD DS Auth for Azure File Shares / DNS Configuration Question

Hi all, I'm setting up our environment to "enable AD DS authentication for your Azure file shares" which was just recently offered in Azure. There are couple things that you have to do to get this work and one of them is to 'Configure DNS forwarding for Azure Files". The link to do this is: https://docs.microsoft.com/en-us/azure/storage/files/storage-files-networking-dns

As part of the setup you have to use some commands in the Azure File Hybrid PowerShell module. One of these commands is "New-AzDnsForwarder". Based on the doc, it seems that this command will (1) create 2 DNS servers in your Azure subscription and then (2) will create a Conditional Forwarder on your on-premises DNS servers for the core.windows.net domain.

I understand what needs to be done to configure DNS for AD DS authentication to work, however, I question what the New-AzDnsForwarder command does to your on-prem DNS servers. Questions like: (1) How does the command figure out which DNS servers that are in my on-prem environment (DNS servers exist on all of the internal domain controllers and there are many). (2) How does the command select which DNS server to add the Conditional Forwarder configuration to? (3) Does it configure the Conditional Forwarder on one DNS server or all of them?

I'm skeptical to run this command until I know a little bit more of what it does to my on-prem environment.

Does anybody have any detailed information on what the New-AzDnsForwarder command actually does to your Active Directory architecture?

Any feedback would be much appreciated.