The counter must be capable of supporting a minimum of 500 pounds. The recommended clearance for airflow is 2 inches in the back and 12 inches on the top of the Viper. If both sides of the Viper have a clearance of 2”, then the Viper may be flush to the wall in the back.
Note: take proper precaution to avoid scratching the counter when sliding the Viper into place. A table lift capable of supporting 500+ lbs. is recommended.