Yes, it is important to have the correct type of 'Mechanical Stop' on a sliding gate for both fully closed as well as opened.
Closed Gate Stop
In many cases the 'Closed Gate Stop' may be the Gatepost.
Opened Gate Stop
It is extremely important (for safety reasons) to have an 'Opened Gate Stop' installed to ensure when the gate is opened manually, it will not run off its guide rail.
The best type of 'Opened Gate Stop' is one that stops the gate (click here -->> Sliding Gate Stops.pdf for details) to ensure the gate stops effectively.
