Cait's Invisible Power
I know why you're here, "Oooh buzzword." But here it's not just a buzzword and is literally applicable. I'm referring to how she can hide traps under your tower.
Good players would play around the trap when she places it under your tower where they can't see it. They'll see her animation and assume she placed a trap where they can't see it. They'll not going to step under their tower where the terrain is hidden by it (from the summoners POV). Then being able to see the trap doesn't change anything, does it? They're still zoned, the trap still works.
There are times when an adc or support get to lane after Cait has already trapped under their tower. In these cases there's no way to know there's a trap there. In these cases seeing the trap would take away her invisible power.
Most other traps are visible or even destroyed by a tower, but for some reason her traps are immune to this. Don't other traps have an animation as well? Don't they all have a cast time? Why is cait's trap the only one that can be hidden under an enemy's tower? Not only that, but the champions would clearly be able to see the trap, it's only invisible because of the POV of the summoner!
I'm not saying she shouldn't be allowed to place traps there but that they should be visible, because only things in fog of war or bushes are supposed to be invisible. Cait's traps are meant to be visible and are balanced around being visible. So make them visible where they should be.