Hey so i really want to build a tray on the bottom side of my desk for my piano to slide out. Now i thought im just gonna put a wooden tray with slides under the desk, but now i found a video of a guy putting the piano straight onto slides (https://www.youtube.com/watch?v=0yucl8bvuMM) this seems kinda crazy and unsafe to me? Do you think it would be better because i am a little concerned with leg space. Thanks for the help :)