Just wanted to know if I need 1 or 2 switchbots to toggle the upper rocker switch from 'constant' (shown) to 'timed' and back. The switch is about 3cm long and protrudes from the timer about 8mm when out. That would be fine. I'm guessing it would be impossible to switch to the middle 'off' position which requires the rocker to be exactly half way. Many thanks for a superb product idea.