Slides require special consideration, especially slides over 18'. Big slides need flat ground. The Bouncer/Slide Combos can accommodate a mild slope, as long as the actual slide on the unit points directly uphill or downhill. Even tilting the slide slightly sideways can increase the chance of rubbing-related, skin burns. Once again, if you are unsure about your setup location, please contact us with the details of your setup location along with measurements and pictures if you have them.