For PS3 and PS4 I have my imports in with my regular games, since they all play on the same system.
For Xbox 360- If it plays on my NTSC console, It goes with my main games. I do have maybe 10-12 imports that I keep with my XB1 games, since that's the console they play on. They are not mixed in of course, just put after reg Xb1 games.