I started out with my SCs about 2" off the floor using some Ikea glass candle holders that go for about $0.49/each. Same for the power cords.
What I found was when I raised the SCs higher, the sound got better and anything above about half a foot didn’t make a difference anymore (I must have reached the offending limits of the synthetic carpet I’m stuck with).
Not having anything that could suspend the SCs that high, it occurred to me that my system is pretty close to the front wall so I ended up using some Command Wall Hooks that use double sided tape to suspend my SCs with.
If your SCs are thin enough to fit within the hook and you’re not obsessed with the looks, they work really well. That, and vacuuming is a breeze with nothing to lift out of the way.
All the best,
Nonoise