One amp, two sub cabinets, how to setup?

I am not technical, so bear with me. I have one subwoofer amp plate, 240w, and two sub cabinets, hoping to set them up in stereo. Hooking the main amp to the sub amp isn't a problem. I think I know how to hook that up. The concern is the sub amp.

The sub amp has a red and a black line out. Each cab has a red and a black in. Can you picture it? Can I hook up one side of the amp, say the black, to both the red and black terminals of one cab and then, say the red, to both the red and black terminals of the OTHER cab? Will this work?

Or, should I just get another amp plate so that each sub cab has its own amp. The sub amp wasn't that expensive, so getting another won't break my bank.

Thanks in advance...