Setup ADFS 3.0 on a non routable domain mycompany.local

We have a local non-routable domain mycompany.local environment and all the AD users has additional mycompany.com.au suffix. AD Sync with Office365 is working via Azure AD connector currently.
We own the mycompany.com.au domain. I am planning to user adfs.mycompany.com.au as Federation Service Name
Is there any step by step guide for this scenario? I couldn't find much around the internet.

I have few questions that I couldn't find the answer yet.

Q1. Can I install ADFS on the non-routable server ADFS01.mycompany.local?  if yes, what would be necessary steps to follow?
Q2. Can I install Web Application proxy on the non-routable server ADFS02.mycompany.local and use port forwarding to route traffic from adfs.mycompany.com.au to internal IP address of ADFS02.mycompany.local?
Q3. Can I use domain CA to generate the certification for ADFS to use?  Do I just put both adfs.mycompany.com.au and ADFS01.mycompany.local on the certification?

Any recommendation would be much appreciated.
thomas yangAsked:
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MaheshArchitectCommented:
use split dns system
u can install adfs on domain joined server
however adfs service name must match to public fqdn
u need certificate from public ca only and .local hostname is not Allowed there and not required as well
adfs proxy need to be published on internet while adfs will remain with on premise network only
authentication requests from internet will be proxyed to adfs from proxy
u will get lots post how to configure adfs and proxy
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MaheshArchitectCommented:
create company.com zone on corporate network and add host record for adfs service name such as adfs.company.com and point it to internal ip of adfs server
one more record need on public dns zone pointing to adfs.company.com pointing to public ip
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thomas yangAuthor Commented:
Mahesh, you are a legend. I couldn't believe your confirmation has solved my puzzle.  I am able to test the log in activities successfully to the domain via ADFS over the cloud now.  Sincerely appreciate your help!!!!!
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