Which Configuration Do I Need as a Server PC? Thread

Hello Friends,

Me and my pro blogger friend "Gustavo Woltmann" just start a new online marketing business and open a new office in the USA for a support.
So for our support members we established a Customer Care by using 20 vCloud mini computers.
So we need a best configured desktop computer which works as a server of these 20 vClouds.
Now we need your suggestion about the configuration of our server PC.
Please be specific about hardware, ram, rom, ssd, motherboard etc.

Thanks in advance.
Have a nice day