Boer artillery was important for the set piece battles like Spion Kop when it proved so devastating.
The quick firers added a 20th century dimension to the Boer war which is one of its attractions from a wargaming point of view as it is like a mix of two periods.
There is a Boer war pom pom gun in a park in Plymouth. A local historian told me about it as I assumed it had come off a destroyer or some other warship. It was stuck in the middle of a small park like a kids roundabout and as I said at the time there can't be many of those left.
See web site below