PEAP Certificate when using RADIUS Proxy

Hi,

I need to use PEAP in the wireless environment. I am using Win2012 R2 for Radius proxy server and Radius servers.

When I configure PEAP at first Radius server, I get the following message:

Image may be NSFW.
Clik here to view.

I need to know where to import the certificate for PEAP in a RADIUS Proxy environment:

Image may be NSFW.
Clik here to view.

Only At Radius Proxy Server?

Or

Only At all of the Radius servers? If yes, Does the same certificate need to be imported at all of the radius servers? or I need to obtain different certificates for every Radius server?

Or

At Radius Proxy server and Radius servers?

Thanks in advance!