The system Klopp uses is excellent. Their main threat is the front 3, especially Mane and Salah. These two live in the half spaces between full backs and CBs. But if you shut these down you open up the wings for Robertson and TAA.
I think the answer is to play to probably play a tight 3-4-3. the 3 CB's to basically man mark their front 3. 2 mids to back up the CB's and screen them. And 3 attacking players to give their CB's and FB's something to think about and hopefully give them problems positionally and on the counter.