I have them outside in a water tray system except my Nepenthes sits below them on a rack that's close to the ground.
So all my plants catches flying insects except the Nepenthes, it catches both.
Sometimes I feel like I am missing out on catching other insects than flying for the majority of my plants.
Do your plants act as insecticides? I noticed a decrease of wasps population in my backyard.
Also after a couple of months, I noticed the plants caught less insects.
So I had my dog poo near the grow area and NOW all my plants are so full with different size flies.
I must admit, the interaction between bugs and plants is one of the reason why I love CPs.