The thing that makes a salad “shopska” is the cheese. Tomatoes, cucumbers and cheese is all you need to get a “shopska”, you can add other stuff too, it doesn’t matter as long as it’s mostly tomatoes and cucumbers. Except olives. Olives make the salad “greek”.
Also, yes, the salad is eaten as a side to the hard drinks and in winter it’s pickled vegetables mostly.