LIMIT of Channels for Single Dialer Vs Balance Dialing

[vkad]

What is the average limit of channels for a single dialer?
What is the average limit of channels on a dialer for balance dialing?

We are faced with two choices, either to have:
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Asterisk Dialer act as agent server, with 120 channels allowed for dialing (AGENTS ALLOWED ONLY ON THIS SERVER) (Works as the WebRTC server)
+ An Additional Dialer with another 120 channels allowed for dialing through BALANCE DIALING (NO AGENTS ALLOWED ON THIS SERVER) (No need to enable WebRTC on additional Dialer as calls are given to the agent asterisk server)
=========================================================OR================================================================
Asterisk Dialer act as agent server, with 120 channels allowed for dialing (HALF AGENTS ON THIS SERVER)
+ An Additional Dialer Asterisk Dialer act as agent server, with 120 channels allowed for dialing (HALF AGENTS ON THIS SERVER) (How will this server work with WebRTC?)
==================================================================

QUESTION: What is the maximum number of channels we should have in each case? The number of agents is 12-15 with a dialing ratio of 1:10 - 1:15?


Vicibox 8.0.1 with Asterisk 13.20.0
Remote Archive Server
1 x Express = E3-1270v5 + 16GB DDR4 + 256GB SSD (Current)
+
1 x Dialer = E3-1270 + 8GB DDR4 + 128GB SSD (Additional Server for Dialer we would like to add)

[vkad]

Anyone able to help me out? Thanks guys.