You dont want to use stock bung as it will get to hot there. So leave your stock 02 sensors. The closest safest place to put the wideband is the front of the testpipes at the 3 or 9 oclock position.
You don't have to use the innovate software but it is another free tool to use if you need it. Nistune connects to the WB when you hook it up to the computer. Im not sure about how the DLP works so I don't know about that one. Im running the Innovate LC-1.