This is very sturdy piece of precisely machined aluminium, no sharp edges, and precisely made to fit any Tyros accessory holes at the back.
I now have my microphone boom arm mounted directly on the holder, mounted on the back of the keyboard. And now I have one less stand to carry around on different gigs, which is just great!
Realizing how useful is, I'm going to buy at least 2 more of those with stands for a phone and an iPad.