alot of our computers use relays and require hardware bricks to be in close proximity
or you could target a named brick for the relay and not even worry about it having to be next to the target
also:

(ignore the quality. I guess I forgot to make it take png screenshots)
17 usable bricks, not including a power button
that's twice what you said you needed
and if you want it really small, use just the white parts; that's exactly seven
why would it need to be any smaller?