I have recently bought a pack of 2 x60 decos for my 3 floor house.the modem is located  In the middle floor , and I have LAN network connections going directly to the basement and to the upper floor. I have placed the units in the upper and the basement floor and connected them both to the modem by cables.

Originally I have managed to setup 1 network where on of the units is the main and the other unit is secondary in this network but the app is stating that the signal to the secondary is week. 

As I don't really need another unit in the middle floor since I have the wifi modem them , I though that a good solution would be to remove the secondary unit from the network I have created and set up a new network just for it. To the outcome would be 2 separate networks with 2 main decos. One for the upper floor and one for the basement. Not matter what is do , powering of  the modem and the unit simultaneously or one afrer the other . This deco still can't be found during the setup process and the led light is pulse red suggesting that this unit is disconnected from the main deco. Is what I am trying to do valid ? What am i doing worng.