I haven't done this, but have you considered an alternative approach - disabling the firewall post-install via netsh (so it could be scripted?) ...

1. Disable Firewall and Antivirus Windows Firewall or third-party antivirus software monitors traffic to prevent unauthorized ...

That's the problem. Exchange uses a range of around 2000 ports - some of which get used for other things as well. Microsoft pretty much told me "Don't do it that way. Shut off the firewall when ...