Dear community,

i just bought a deco x60 3 pack and i am looking for some help at setting up the best signal coverage and speeds.

I live in Belgium where our houses are build with brick walls and concrete floor.
I can get 2 Deco's setup witch are pretty close ( around 6m with floor between)
My main issue is getting the 3'd Deco in the living area, for some reason i cant pick up a signal coming from the main one.
The Main one i setup on the second floor in the middle of the hallway on top of a desk so no blockage.
Is it possible that the signal going down is just to much concrete for it to make a connection?
Is it maybe a good idea if i place my main deco in a tv cabinet?  i'm assuming its probably a waste of a deco if i place it there.

Sorry for the long post hope you guys can help, have a lovely day.