What are the most reliable methods for ensuring accurate anchoring systems across multiple room scans?

Example Concept: Spatial anchors are used to fix virtual objects in real-world locations, even across different sessions or devices. These anchors rely on environmental features captured during room scans, allowing for persistent positioning. By using cloud-based services, such as Azure Spatial Anchors or ARKit's ARWorldMap, developers can synchronize anchor data across multiple devices and sessions, ensuring that virtual content remains accurately positioned relative to the physical environment.