The fridge needs to have lots of clearance around it. The cabinet has to be vented. Dedicated mini fridge cabinets usually have a small extractor fan to help with this ventilation. That's why it's perfectly fine to get something like the Breakfast Dining Table because the mini fridge has clearance and open ventilation.  However, you don't just want to shove your mini fridge into a cabinet you already have without modifying it for ventilation.