you can get single channel, 2 channel, 4 channel (for individual coils) etc.

don't know what they're fitted to as standard, just know that they're available (from IMA for example)

they can easily be wired in instead of two singles, and yes it just needs the board from SECS to work. you still need 2 triggers from the ecu to get each channel amp to fire the correct side of the coil for the correct plug pair