Link an 871 router/switch wirelessly to an ISP-provided DSL modem//router?

Hi, Upstairs we have a 20-Mbps ISP-provided DSL wireless modem/router, and one floor lower, in basement, I would like to install a refurbished 871 Cisco router, without adding a separate Internet connection. I would like the 871 to connect wirelessly to the DSL router.  To the 871 I would wirelessly connect 2 workstations, one of which will host 3-4 virtual machines. The 2 main reasons for this weird arrangement are so my virtual machines and virtual switch do not interfere with upstairs devices connected to the DSL router, and so I can practice Cisco router//switch configuration downstairs where I reside, without added expense of a separate Internet connection.   Would I need a separate repeater between the two routers?   Humbly requesting any other feedback. 
Jeff

To have all routers using the same Network Name and wireless password, you would have to configure them for a roaming network. This would require that the Extreme and Express connect individually back to the Pirelli router via an Ethernet connection.

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