Clement seems pretty solid. Light hitting guy who can field. He may not be a great SS, but if he can do it even somewhat below average to go along with 90 wRC+ he's a useful UT infielder for a playoff team. To be a 2 WAR guy he either needs the defense to be better than I think or he needs to hit for more power, both of which are possible.
Horwitz has barely played so he's even harder to get a read on. He'll need his recent AAA power spike to hold moving forward to be anything more than a bench player. But if the power is there, he could be a strong side platoon player who Ross trades for a setup man in a couple of years.