Creating an Input bias current return path (for an amplification circuit)
Due to the low impedance of your sensor, you should be able to just use one return resistor connected between either of the inputs and the device ground. As far as the value of the resistor being 10 MOhm, I would say that is a bit high given the typical recommendations, but it should be fine for most applications. It will only give a voltage error around 10 mV (assuming the worst case Ibias of 1 nA), depending on your gain and application this might give an acceptable output error.

I am by no means well versed in this area, so I would recommend using something like TINA-TI to simulate TI's model of this amp in your application.