I know this is an old post, but in the event you didn't solve it.
I have an SX80 wall mounted behind a TV using a 1U wall mount. So standard SX80 rack ears, and then just flips it so it hangs vertically.
I'm using one from StarTech - RK119WALLV.
I actually had my mounted at 90°, but if you are going to have it ports down or ports up, I would double check which direction the fans blow and try to mount it so that the fans are blowing the heat up so you aren't fighting them. I don't remember if the SX80 draws air front to back or back to front.