I've tried the Ratio system with one signal. It works, but needs careful adjustment. If you use small screw-eyes to change direction of the control thread try and keep the changes of direction small - at most a right-angle, preferably less.
Main problem is that the signals, being all plastic, are easily damaged, particularly if the layout is a portable one.
If you are using other makes of signal I'd be inclined to use another control system - wire in tube, rods under the baseboard or solenoids.