I have bm stored in normal chilled fridge & I would like to try freezing them. Can I confirm if the milk is less than 3 days I can freeze them? And my fridge is those with bottom freezer, does the 3 month rule still applies? It is advised to put at the "back of the freezer" does it mean I just put the milk bags further in?

Yes, you can store bm in freezer up to 6-12 months even after you place them in fridge (without freezing) for 3 days. Yes, you need to put the breastmilk storage bags further in the freezer if you tend to open the freezer quite often so to maintain the temperature of the milk (18-20 degree celcius). If you have chest/upright freezer, it will be not problem if you didn't put the bags at the back of freezer.