If you can connect all 12 screens to a single player, it will work. You can either connect 12 displays by using litters and tiling or you can purchase 3x NVS510 and connect each directly to the pc and make a mosaic on the nvidia sw.
Then you can assign that player with the suitable resolutiın and design a layout accordingly.
Maybe my recent issue may help you. It’s for windows but you may relate the CMS and the configuration I suppose.