Connect+ is capable of supporting up to 16 total Bluetooth Smart devices. This includes Touchpads as well as any phones that are enrolled over the Bluetooth link (note: there are no limits to phones or tablets controlling Connect+ over the cloud service, only over the Bluetooth local connection).
Note – the refresh rate of the Touchpads will be slower if you have more devices enrolled, as system status changes will need to be transmitted to a larger group of devices.