I got the "myWall HS20L" and they look great and work perfectly. Was easy to assemble.

the rear speakers are designed to sit on anything so they can blend into the background--I have mine on the window seal. Both of them needs to be plugged in, so keep that in mind when you are looking for a stand. Overall the Q990D is great and I could not be happier with it.

Incidentally, Amazon, IKEA, Galaxus, Samsung, etc. offer masses of speaker stands, some of which are also height-adjustable.

Watch "desk+mount+speaker+stands" on Youtube. Maybe there's something suitable for you. Or it might give you a few ideas. If you're handy, build something yourself.