I have a 6 room terraced house and 5 decos. I'm not sure which is where without taking them off the wall, but it's something like this: 
1st floor:

P7 Main (office) -> nothing (bedroom1) -> P7 (bedroom 2)

Ground floor:

M9 (lounge) -> M9 or M5 (dining room) -> M9 or M5 (kitchen)

Unfortunately the kitchen gets a super weak signal, as to be useless. How can I get a better signal in the kitchen? Is there something better than a P7 or M9 or M5?

Thanks in advance.