Catch cans work.
125,300-oil Change
I believe the 2013+ ecoboost 3.5 already have an oil separator (catch can) built into the rear valve cover. You catching oil ahead of that separator.
The 'fisheyes' in the oil in the catch can are likely water as well. I think these things are like "cold air kits". More marketing than substance. I regret buying mine. (The Hellcat's not getting one - even more useless on a PFI engine.)