Hi Don,
thanks for your feedback. You are right about the integration. IPAM & UDT (or NPM) integrates automatically only in a case that they are all installed on the same server. Why are you worried from installing IPAM along with your UDT and NPM, performance or theoretical problems with stability of your production server?
If you install IPAM standalone it will use it's own database and then it won't integrate with UDT on your primary server.