The sides need to be placed above the main L + R for the playback of 2+2+2 sources
It sounds like you are describing height to me if they need to be placed above the main L+R ?
Correct. The 2+2+2 format is for height. This format is supported by the compagny MDG and also Chesky.
With MDG the heights are like half the distance between Left and Right above the Left and Right speakers.
With chesky the heights are more outside at like 55 degrees.
Checky:
6.0 format explained MDG:
2+2+2 explained in English The funny thing is that there are perhaps 40 music tiles out with this audio format, and Meridian supported it since the beginning. The more usable Dolby prologic IIz for height informatie extraction for movies is not (yet) supported.