I live in a condo with creaky floors (we hear every footstep from upstairs), which we've slowly gotten used to in our time here. However, our upstairs neighbors recently bought a foosball table that has resulted in a serious amount of pounding from above. Fortunately, they've been very nice about it and are willing to put some padding under the table to reduce the impact. Can anyone recommend a good choice for this? I've seen a couple of things online recommending "elephant bark," has anyone used this? Has anyone done something like this and had good luck with other brands?