2D when instantiate enemy, at my top side, but at another player's bottom side

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Thanks for browsing my question, this game is my company's big project. Sorry for my poor English.
My game is 2D and only two players. Place I need to defend is on my bottom screen, and on another player's top screen. Place another player need to defend is on my top screen, and on another player's bottom screen. Now, I instantiate an enemy, is can run on my top screen, but run on another player's top screen, too. I need my created enemy run on my top screen, and run on another player's bottom screen, that is "mirror" the game.

I have searched a good manner, but it will make something wrong. Make one player's camera view whole world from the other side, but one player will view all sprites reverse.

Thanks a lot. Appreciate!