"This does work"
The bottle needs to be supported by a cane otherwise the weight of water makes the bottle tip one way or another. There should be a blanking cap along with the water spikes. If this cap is put in the hole below the bottle then the majority of water will be forced the length of the run. If a watering spike is underneath the bottle end then the force of water will go mainly to the first couple of watering points. Small canes need to be used along the run with the clips provided and everything should stay steady. I have had these for several years and had no problem other than changing bottles.