This should always be assessed on location. A good gutter is a zinc box or mast gutter with sufficient gutter brackets (every 60 cm and fixed in healthy wood). A plastic or aluminum gutter is not a good gutter. The solution for this is the RSS base plate or another solution than the RSS system.
It is also important that the anti-lift device (red hook of the upright) can get caught behind an edge, so that the system is properly secured.