We each had gates from Safety-First. The gates were also installed at the top and bottom. This worked very well in the old apartment. However, since there was a round stair stringer (steel spiral staircase) there, we had to improvise. The gates were disposed of during the move.
In the house, after a warning from an acquaintance, we got new gates again because our little one was about 2 years old at the time. These had to be installed according to the stair width including all possible extensions (were clamped between the wall and stringer). No problem with the mounting. It was also quite stable. However, safety-First had changed the locking system compared to the old doors. Our daughter, 4 years old, opened the lock immediately. The little one needed 2 weeks and then figured out the trick as well. Thus, about 2 months later, we took the risk and took the gates down again.
However – we built “in reverse,” since the house was built on a slope. That means the bedrooms are downstairs and the living rooms upstairs. Therefore, the little one cannot fall down the stairs while half asleep – he at most climbs up sleepily and is then carried down by mom or dad. Now the kids are 3.5 and 5.5 years old and the issue has resolved itself anyway.
