Use devices with your one local or centralized server - you can keep them fully isolated from public Internet network. Shelly Plus 2PM is compatible with most popular voice assistants like Alexa, Google Assistant, Yandex Alice.
Shelly Plus 1 - Relay Switch 12V/24V-60V DC / 240VAC WiFi 16A - Android / iOS Botland - Robotic Shop
Shelly Plus 2PM, Dual Relay Switch
Shelly Plus 2PM - relay switch with power metering 2x 10A (WiFi, Bl