Right now I use 2 different accounts for 2 different echo in the same house.. the reason is that when im in my bed room and i say "Alexa, turn on fan".. i want the fan in my bedroom to come on... and when im in my livingroom is i say "Alexa, turn on fan" i want my living room fan to come on... on my smart home system i have devices name "Livingroom fan" and "Bedroom Fan". but that is too much to say.. specially have you have lights lamps TVs and more. So i use groups to give my smart devices a shorter name on each device.. and it works perfect.. and i still can turn off the fan in the living room from the bed room if i use the full name. "Alexa, turn off livingroom fan". if each echo had its own groups then it would work just like i have it working now..i would like one in every room.