Looking at your post again, to be clear, the speaker itself is supported by the ball bearings that are placed in the cutouts for them in the separate flat base that goes on the floor. I don't know if the Baby Grands have spikes for that base; my Micro References have a stand mount that does have spikes on the feet of the stand.
By the way, great speakers; hope you enjoy yours as much as I enjoy my Micros.

