I am looking for some good HowTos for properly setting up DNS and DHCP for multiple physical sites using UCS
at this time there is no Howto regarding your szenario.
As described in Which login server? Slow logons you may set up AD-Sites as described in the Microsoft documentation. For suggestions for your requirements, more informations would be needed:
[li] How are your sites connected to each other[/li]
[li] What exactly should be achieved (distributed DNS and DHCP servers for each site?, Distributed logon/share services?)[/li][/ul]
For concrete questions you may contact our sales team (firstname.lastname@example.org) which would be happy to help you work out a solution together with our consulting team.