I did notice the constant 12v earlier today. Is it fused?The two fans will produce less air flow, through less of the radiator. That seems like a bad idea, since the LS cooling capacity is just enough as it is.
No, you can't just connect them. That connector has full power that is always on, even when the key is off. There are two control signals from the PCM (power and speed) that control the smart motor in the OEM fan assembly. There are control electronics inside the OEM motor that your two other fans will not have.