I can confirm that I have sent OSC from an Eos console to five discrete IP addresses at the same time with no go-between software. One must add each of those addresses to the OSC UDP TX IP Address in Setup with space or comma or semicolon between each one. It might look like this:
Note that by specifying "10.101.50.105:53000" I am telling Eos software to override the "OSC UDP TX Port" setting for 10.101.50.105 and instead send to port 53000.
So far as I am aware there is not a specific limit to the number of addresses you could specify here, but I have only confirmed working up to 5.