That is a combined bridge. Based on your standard piezo length, I think it might be safe to assume you might have enough length to use just one pickup and thread it under both saddles. If that’s not the case, I’d recommend using a guitar pickup as often, they have a piezo that might be longer and has a 1/8” jack for easy connection to the preamp. Having two pickups in the same instrument might cause issues with one pickup picking up vibrations also picked up by the other, so I don’t think 2 in the same instrument would work, but I’m no luthier, so I can’t be for certain.