I am using one Netro Pixie Hose timer to water 2 freestanding planters via a hose splitter. I am looking for a way to add 2 Whisperers to the Netro App to monitor both planters for watering needs. The app appears to only allow one per zone. Is it possible to add a second Whisperer to the same zone? I am not concerned about overwatering as the planters allow for extra water to drain out easily. I just want to make sure neither planter dries out.