Keep in mind that the Studio 20 v.2 was not designed to be wall mounted. I don't remember the port location on the Studio ADP v.2, but if those ports are not in the rear and you're definite on wall mounting, then that might be your only option. Otherwise, I suggest that you look into alternative mounting options like wall or ceiling mounted telescoping platforms, or tall stands. I use a pair of 45" stands for my Studio 20 v.2 surrounds, and those are not easy to find because the Studio 20s weigh 28 lbs. each, and all of the cheap tall stands out there will not support that kind of weight.

In actuality, pointing the speakers down to the listening position is exactly what you should NOT do in positioning the surrounds. If you want to optimize for multichannel music, you should have the surrounds close to height as the mains, and angled at about 110 degrees off-center. If you plan to use the setup for both music and movies, then Dolby's guidelines are to raise the speakers about 2' above ear level and point them directly at one another. This diffuses the sound, which is what you want with movie soundtracks that have mostly ambient sounds in the surrounds. That positioning also maintains the directionality that you want with multichannel music soundtracks.