VEVOR Fire Escape Ladder, 3-Story 25FT Retractable Emergency Fire Ladder, Lightweight Aluminum Alloy Safety Escape Ladders with Sturdy Polyester Strap, Anti-Slip Rung & Wide Steps, 1000LBS Max Loading

If there really isn’t a suitable wall, as long as the window frame is strong enough, you can mount it there. The design is intended for wall mounting, specifically on both ends of a double-curved wall. If this answer does not resolve your issue, please contact us again for assistance.