Yes, you can have as many Drive One devices associated with your account as you like.
- Add a new device
- Start the Drive One app
- Select the menu icon (top right corner of the map, looks like a gearwheel)
- Select “Device” from the menu
- On this list, you can see what devices have been added to your account.
- If you want to add a new device, click on the + icon at the bottom of the page and then follow the instructions for adding a new Drive One device.