Hi folks...
Thought I would post a link to this here, to help anyone who needs to place a music stand behind the PX-5S without using a tripod floor-mount. Basically, I took a standard Manhasset black aluminum table-top stand (Model #53) and raised it by five inches... the lip is just above the back of the board, and it does not interfere with cables. As an added bonus, the legs fold out of the way for packing or stowage... that was a key issue for my studio (which is aboard a sailboat, where space is at a premium).
Here is a little how-to article with photos:
https://microship.com/how-to/music-stand-px-5s-digital-piano/
Cheers!
Steve