I bought these to use with Yamaha's HS 5's and the foam pads deform with the weight of the speaker, making it not stand horizontally. It makes the speaker tilted, not a lot, but noticeably tilted.
Also, care with table stability, as the speakers tend to wobble when the table is moved. My speakers never fell, as I've never moved my table too much with them on it.
Good sound absorption nonetheless, maybe with bigger or lighter speakers they will be better.