@Avind The AlphaPix 4 can have 680 pixels per output, the 16 can have 340, obviously that's using power injection. HC recommends max of 120 pixels per output if powering direct from the controller.
I think to set that up in xlights you'd have to set max number of pixels to 120 (Channels per Universe = 360) then have the first output with 120 pixels and the second 112