Make sure that there is enough space for ventilation underneath and at the back of your fridge-freezer. This will keep the power requirement down.
The floor your fridge-freezer stands must be level. You can then ensure that it is installed horizontally and the door always closes perfectly.
If your recess is too small to meet your needs, you can replace your old built-in appliance with a free-standing one. You can fit a steam oven and warming drawer into the cleared recess, or simply use it for additional storage.