Hi,
I had the same problem with my es920 piano and sx900. Mine is purely home use only. I didn’t know what type of stand to get either. In the end, my solution was staring me straight in the face, an old hall stand. 4ft long, just over a foot deep, and about 1inch taller than the piano. It allowed me to slide the sx900 over the top of the piano, with a
1 inch gap between the piano and the keyboard , one set of keys just behind the other, looks like a double manual organ. Able to reach the sx900 buttons reasonably easily from sitting position.
Unfortunately using my PA5x 88 note is not going to be as easy to set up as the es920. Can’t slide the sx900 over the top in the same way. The PA5x is deeper and I’d be covering up the screen and buttons. Back to the drawing board. At the moment I have it at the side. Love to find to find some way of vertically mounting it.
Glad to see you found a solution for yours.