Inventory locations such as shelves in a materials handling facility may be used to store items of various shapes and sizes. Described is an inventory location that houses onboard electronics such as sensors to acquire sensor data and computing devices to process the sensor data. The sensors may include one or more weight sensors, position encoders for auto-facing units, and so forth. The inventory location includes features to protect the onboard electronics and facilitate physical reconfiguration to support products of different shapes and sizes.