I took this from the download PDF of the MP10w ES driver. As I read it, if you go pairs at any level now 10, 20, 40 or mix. If you have the "w" ES controllers they will wirelessly sync. I may be wrong so please read it for yourself to be sure. Have fun!
"The MP10 and MP10w share the same award-winning technology as the MP40w and lets you take full control of the flow. Similarly to the MP40w, the MP10w comes with the EcoSmart Wireless Driver that enables wireless coordination and enhanced functionality between multiiple With all the electrical components outside the aquarium and a variety of easy-to-program modes, the VorTech is the safest, most versatile pump on the market."