The software only supports two modes, sector mode, which would support 8x8, and 4x4 (back to back), OR omni mode, which would support 4x 2x2 with 360deg coverage. Because beamforming is not enabled in omni-mode, it’s important to make sure that coverage is not overlapping. There’s a pretty good discussion on the pros/cons of the 4500c here:
I have not seen any feedback from anyone that has tried the config that you’ve proposed. Why don’t you go and deploy and let us know how it goes?