Robotic vacuums are generally not designed to clean stairs due to their inability to navigate vertical surfaces. However, they can clean areas near stairs safely thanks to advanced sensors that prevent them from falling. If you need a robotic vacuum to handle stair cleaning specifically, here are some considerations:

1. Edge Detection: Ensure the robot has reliable cliff sensors to avoid falling down stairs.
2. Portable Design: Look for lightweight models that are easy to carry, so you can manually place them on different floors or landings.

Since no robotic vacuum and mop can currently clean stairs, you may want to consider a handheld vacuum or a lightweight stick vacuum for this task. Combining a robot vacuum for flat surfaces with a handheld device for stairs offers a comprehensive cleaning solution.