Floor vent under stove, does it need to be moved?
Moving would be better as freestanding ranges set very close to the floor. You would only have about one inch of clearance to redirect the discharge of the vent opening to blow from beneath the range. I am sure you could fabricate a diverter of some sort but being only one inch in height, the discharge velocity would be loud and you could definitely feel it on your feet while standing at the range.
Again, it would probably be easier to relocate. BTW, the space at the bottom of your cabinets is called the "toekick."