You should be aware that at you raise a floorstanding speaker away from the floor, there will be less deep bass. The closer a speaker is to boundaries -- the floor, wall behind, and to the side walls, the greater the deep bass output, because of "boundary reinforcement".
It may not be all that significant, especially if you have a subwoofer. On the other hand, you can always experiment with a couple of milk crates, and see if you can hear any difference when you play recordings with deep bass.
Sometimes a big floorstander may benefit by being raised off the floor, especially one that delivers too much bass when it's on the floor. I recall double-blind tests of a big expensive British floorstander that was given mediocre ratings because of "fat, tubby bass". When the speaker was raised from the floor by about 1 foot, the ratings in the double-blind tests went up dramatically because the bass was much smoother and not "tubby".
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