Hello A 10% slope should not be a problem for the Roomba. However, you have the possibility to try the Roomba directly at iRobot before buying it from Digitex/Glaxus. This way you can make sure that the Roomba does not have any problems with the slope or the conditions of your flat. If you have any questions or doubts, please do not hesitate to contact us directly. You can reach us by e-mail at service@irobotics.ch or by phone at +41 62 746 06 74. With our best regards, Your iRobot team