My Winny 25RKS's pump sounded like a ravenous wolverine caught in a trap. Mounted directly to the plywood floor under the sink, like a sounding board, it was way too loud for my liking.
Taking a 2' X 2' square of 1/2" foam rubber flooring, cutting it down to fit, I unscrewed the pump and connecting hoses, that were also screwed to the floor, secured both to the flooring mat with plastic zip ties. Because the mat contacts 2 sides of the area, it's not going to go anywhere. Now, I hear only a pleasant "hum". It took me about an hour, only because of the accessibility was limited.