Are you trying to:
1. Set up ClearPass Poplicy Manager as a NODE fed by a third-party RADIUS proxy,
2. Set up ClearPass Policy manager AS a RADIUS proxy
or
3. Both?
I have CPPM set up with 2 CPPM proxies & 2 modes. The proxies are set up lto load balance across the nodes. There are two proxies for redundancy.
Until we understand your goals, it is difficult to offer a solution. The Proxy targets are used for nodes when CPPM is set up AS the proxy server.
The nodes need the proxy servers set up as devices. The controllers & switches are set up as devices on the proxy servers. The clients only see the nodes and the switches/controlers only see the proxy servers.