When soaking pork liver in milk for 2 hours, should I place it in the fridge or at room temperature? I'm worried it might go bad, as my room is pretty hot in the summer...
Yes, you can safely soak it at room temperature, but why would you? There's no reason not to refrigerate.
Meat is safe for about 2 hours in the temperature danger zone of 40F/4C to 140F/60C. Beyond that, it should be cooked or refrigerated. So, if you do decide to soak at room temperature you should cook or chill it promptly.