I guess you should rather contact Nvidia sales dpt about this:
https://www.nvidia.com/de-de/contact/sales/
From the technical standpoint, the top model capable of this is currently the RTX A6000 in Mosaic mode, each can drive 4 displays, up to 8 can be stacked to drive up to 32 displays. Per 4 gpus, a Quadro Sync 2 card is also needed, so two of them for 6/8 RTX A6000.
Of course, a mainboard capable of running all of this in SLI mode is necessary.
MacOS is not supported, no drivers available.
https://www.nvidia.com/en-us/design-visualization/rtx-a6000/
https://www.nvidia.com/en-us/design-visualization/solutions/quadro-sync/