No, it is not okay to install a Viking range or any other cooking appliance near a combustible wall surface. A safe distance of at least 18 inches (45.7 centimeters) should be maintained between the back of the range and any combustible materials such as walls, cabinets, or curtains. This ensures proper ventilation and reduces the risk of fire hazards. Follow the installation guidelines provided by Viking in the range's user manual and consult local building codes to ensure compliance with safety regulations. Installing the range at a safe distance from combustible surfaces is crucial to maintain a safe cooking environment in your kitchen.