Similar numbers at my large legacy US carrier for the 737 NG. Nothing ever stated, just average planning arrival fuel that is equal or better to the OP's numbers. Never had a call in over a decade of adding more than that amount. Pretty good number considering possible flap problem resolution. USA FL thunderstorms can add quite a bit to the amount needed for a proper comfort level. My personal record is adding up to 14500 lbs overhead and landing with less than 5K.