2 Routers on 1 Modem?

Hi I want to connect 2 routers to my modem. One will be downstairs in the basement and one will be upstairs. My modem is 400 mbps. But I was wondering if they're both gonna perform on 400mbps or does it get distributed equally, half and half to each router, or is it even possible to do that. I was also... show more Hi I want to connect 2 routers to my modem. One will be downstairs in the basement and one will be upstairs. My modem is 400 mbps. But I was wondering if they're both gonna perform on 400mbps or does it get distributed equally, half and half to each router, or is it even possible to do that. I was also considering a wifi extender.
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