I found a much cheaper solution - (US$31.33) On Stage LPT6000 Multi Purpose Laptop Stand with adjustable height, free standing (on top of the keyboard) / mounting options (mount to a nearby table or keyboard stand):
https://www.amazon.com/gp/product/B001B2M108/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

Thanks,
Paul
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Yamaha Genos, Ketron SD90, Korg Kronos 2 88, Korg PA1000, Casio Privia PX560