OK -- I was unhelpful. I apologize.
The problem is, I don't know if you set up the wireless routers, that they will constitute one network. It would seem that if you set them up with the same parameters, that they should "present" as one network (like at your school).
It occurred to me that even if they don't, your hardware will have two networks from which to choose. I'd have to read more about it. At least then, you could choose the network point giving you best signal strength.
That's not a good answer at all. I'm pretty sure someone has done this.