You would need to lease 2 different seats in order to get member rates for BOTH YM and NQ. CME Group did not consolidate the seats at the CME and CBOT, so the member rates only apply to the seats that they did prior to the buyout.
In a general sense, the websites are full of info about the different fee structures that are offered to members/lessees/customers. It's a simple matter of figuring out how much you are trading on average and doing the math.
Best of Luck