Robot vacuums can easily go over threshold dividers between rooms, providing the dividers are not more than 1” high. Some models have their main wheels mounted on springs which allow them to smoothly go over any types of flooring transitions that are not higher than 1 inch. However, they’re unable to go over or up stairs. As more models are entering the market at cheaper prices, some homeowners can now afford to buy a unit for each floor of their house.