The Asset List page will show you a list of all of your assets/devices. You can also see how many of your devices are in Failover alarm states of active vs. inactive as well as how many of your devices are in connected vs. disconnected WWAN alarm state, shown as pie charts on the right.
If you would like to see more information on a particular asset/device simply click on the view eyeball icon on the left of the device. This will take you to an Asset Details page.