I used to have my Harbeth speakers on a folding iron bookcase that I had bought from the container store. I just looked and while they no longer seem to have it, amazon does. Just have to be sure it is large enough dimensions to hold it on the top shelf
. The one I just saw is all of $35 in the U.S. so not much of a risk as far as investment At the time I’d also bought silicone kitchen mats to put between the shelf and the bottom of the speaker. You might find an inexpensive wood cutting board to place in between. Fwiw - I couldn’t hear any difference if I kept the lower shelves empty or loaded down with books
