I find 60-70HZ to be about right in my home. But I see nothinh wrong with 80 hertz. If that is low as your mains will go. Have you ever read or heard of Richard Vandersteens take on x-overs ?
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Yes, use two subwoofers, and experiment with crossover frequency. I think that setting this frequency according to how low your main speakers can go is not necessarily best. Even a speaker capable of response well below 80 Hz may sound better when that "grunt work" is taken over by another driver. People worry about "smearing" of higher frequencies when a speaker moves by a tiny amount due to floor vibration or the like. Take a look at what the driver cone is doing to reproduce LF that should go to a SW.