Do I need an Alexa device in the home to control the outlet while we're away?

To control the device, you will need to have the plug join the Brilliant mesh. This will require there to be at least one Brilliant Control in the home, and a Brilliant device (Switch, Control, or another Plug) within the recommended distance from the device.

Once the plug is installed successfully, you will be able to control the device remotely from your Brilliant mobile app automatically while you are away. If your Brilliant Smart Home System is connected to the Brilliant Alexa skill, it can also be controlled via Alexa in the home or remotely.