Thats one of the problems with the Oasys,although its wonderful synth,the Touchscreen is a bit of a blister to fit anywhere practical,unless you just have the oasys or at the least on a single Stand.even those X frame stands you either have to live without seeing the screen at certain angles or have it on the top tier,with the risk of the stand becoming top heavy,
I have mounted mine onto a home made A frame(made up from several other old A frame tubing systems),and put an extra bar so that the Touchscreen is angled at the right position underneath another synth,but the extra bar gives the screen support so that it doesn't move,its also at the right height so I can still see it comfortably sitting down even though its the bottom machine.it is angled slightly but at the right position so its visible all the time something those Quiklok X frames didn't allow for,even with the second tier at full height position.the screen just wouldn't be able to move up enough to use comfortably
I've also had to make the A Frame so that the Oasys is sitting across two cross member tubes,because its just far too heavy for a single tier,even with the locking braces to stop the tubes moving the oasys just simply ripped the brackets out of place,so the only way to do it was to use two Bars to support the weight.Its also at the perfect playing height too,and the frame slides out easily enough if I need to get to the back panels/Wiring(No hernias moving the Oasys here

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I would have liked it placed underneath my Triton Extreme,on the opposite side of the studio where my main writing area is,but because of the screen would have meant that I would have to have it completely down,which isn't really practical unless your stood over it.and I would have had to make a lot of alterations to my workspace,although I made it myself from wood,I didn't want to have to alter it again,and at the time I didn't really have a lot of freetime for DIY,so I found a more practical solution
Another problem is that the Oasys is Quite deep in comparison to other machines so as you can see on your Pic,it overhangs Quite a Bit.
I think it would be nice if we could utilise the Hardware slots on the rear panel to hook up a monitor so you didn't need the Screen all the time and you could fold it flat out of the way,so it could fit under a shelf or desktop

As you can see the support bar behind the Oasys screen stops it moving,when its being tapped,also makes the PadKontrol at a nice height too
If your desk is homemade maybe you could alter it so that the Oasys sits on the shelf below it and make a cut out on the table top so that it allows for the Screen and the controls,but not cut back too much so the whole Oasys is exposed,just enough so it was level with the screen and the table top lip would support the screen and stop it from tilting back when pressed