Putting a refrigerator on a floating floor is definitely doable, but extra precautions need to be taken. Ensure a adequate spacing between other furnitures when deciding where to put it. Also, when shifting the refrigerator use a furniture dolly, do not drag it as that may scratch the surface of the floor. You can also place shorter planks under the refrigerator, to prevent any weight imbalances causing planks to indent from the weight.