I have three different networks consisting of one Deco X10-4G each. I want to expand each network with a Deco M5 mesh unit. The M5 can be bought as 3-pack but can I use each M5 unit to a corresponding X10-4G network? Are all the three M5 units in the 3-pack the same or is only one of them the "master" and the rest are "slaves"?