nDisplay best node scenario

I currently have 8x 4K projectors, and I’m trying to determine the best hardware setup for my needs.

From what I’ve read, it seems that having more nodes, each with a single GPU, is preferable to having fewer nodes with multiple GPUs. Can anyone confirm if this is indeed the best approach?

I’m planning to invest in 4 A6000 Ada GPUs across 4 nodes to power the 8 projectors at 4K. I’ll be using nDisplay, NVIDIA Mosaic, and incorporating both genlock and framelock. Would this setup be overkill for running high-detail scenes with ray tracing, or should I consider scaling up further?