Upright freezers are built into the line of kitchen units, i.e. in the lower units or special high-level cupboards.
Simply replace your built-in upright freezer with a stand-alone one if your recess is too small to meet your needs. You can use the freed-up space for additional storage, or fit a steam oven and warming drawer into the empty recess.
Make sure that there is enough space for ventilation underneath and at the back of your freezer. This will keep the power requirement down.