Very small (1/16) drill bit to make a pilot hole, then a little larger one to make the hole for the screw using the pilot hole as a guide, and screw it down. The very small screw will have an easier time punching it's way through the flooring, and once that pilot hole is there it will be easier to make it bigger.
To really make it quiet, don't just mount it on the floor. Put a piece of carpet under it and put the screws down through that. (There's a good chance that would have worked to quiet down the old pump too.)
BTW - the pumps aren't silent, regardless of brand or quality. They just aren't. They're peristaltic pumps (a lever presses against a bladder - in/out, in/out - like the heart), and that causes them to vibrate. Getting them a little quieter is good though.
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2014 Innsbruck Lite 198BH
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