If you take the over and let's say bet 100 dollars on it, you would have 50 dollars of it on over 2 goals and the other half on 2.5 goals. So if it ended 2-0, you would push on half and lose the other half. That is if I remember correctly.
Is there anywhere which shows betting action on each PL game? It's on Oddschecker and coral have it up on their site but is there anywhere more accurate?