Can anyone tell me how far should these (Photinia fraseri 'Red Robin') be planted from the house. They have been used extensively by the developer of our new house - mostly along the borders on the outside of garden walls to add colour to the streets. However there are some which have been planted along borders under blank walls on some of the houses, ours included, to add some character/colour. I believe these can grow to 4 metres high and am wondering if the roots would be strong enough to interfere with the footings. Anyone know?