The only Cub types equipped with slats that I've seen were the Mackey slats, or copies thereof. Like the original slats that all Helio Couriers came equipped with, these slats deploy based on air pressure. As angle of attack increases, the slats gradually deploy. The Mackey slats are incredibly simple, frankly, and can be added to an existing wing. Here's a link to Backcountry Cub's facebook page, which has several photos of the Mackey slats they use.
Note that the Mackey slats extend from the leading edge, whether deployed or not. As a result they create quite a bit of drag at normal cruise speeds. But, if you want slow flight....they do incredibly well.
The Helio slats were MUCH more complex, and fully faired with the leading edge when retracted, so added no drag at cruise.
Thinking about slats for your OM 170? There's at least one 175 running around in the EX category with Mackey Slats.
Two downsides: They slow you down, at all AOA, including cruise. Second, to REALLY use the slats, you need to get the plane to a very high deck angle. So for stall prevention, they are super. For landings and takeoffs, unless you have VERY long gear and BIG tires, you're going to land tail first on wheels. I doubt they'd be very helpful on floats, because you'd be dragging the heels of the floats all the time.
But, maybe......
Hopefully, Barnstormer will pipe up here. He has a Mackey Cub, with the slats, so has some actual experience with them.
MTV