[Solved] Understanding zextras carbonio services

Hello everyone.
I need help I want to try a multi node installation of zextras carbonio with an automation script.

I have 8 VMs, two Directory Servers 1 in master and one in replica.
two servers to install the MTA-PROXY, two others to make application Servers, one server to make the video and another a file server.
My concern is which server I need to install service discover servers on, and which server I need to install service discover dervers agent on.
Does the Discover Servers service have to be installed on just one server?