I used to use this exact setup, but specifically eliminated monitor #3 as I felt it was counterproductive to have an "always on" comms monitor. These days my main monitor has one workspace, while my secondary has the normal secondary stuff in one workspace, and comms in another.

I found it to be less distracting and the two screens are more physically manageable, and easier to replicate if i change setting (cheaper too!). The only thing I will change is whether I'm in landscape/landscape or landscape/portrait. I can never make up my mind about what I prefer.