Cleanse is a pulsed totem as well, if they all pulse at the same time it only works as one cleanse. If you stagger them you gain the effect from all of them in about the time of 1 round of pulses. It's basically the same concept as all your LvB getting eaten by 1 grounding totem, vs have a double keypress for LvB to stagger them slightly and make sure the majority get through.