Snorkel scissor lifts have automatic self-leveling without outriggers, which provides a stable platform that can level up to 13° from side to side and up to 9° from front to back. However, it's important to note that using boom lifts or scissor lifts on slopes or inclines is generally not recommended. These machines' center of gravity is higher, affecting stability and safety. It is important to refer to the specific Snorkel lift model's operator's manual, consult with a professional technician or receive training to ensure safe operation on side hills or uneven ground.