that is how I have done it. My sofa is just in front of the back wall, so I placed the lab 3 just beside the sofa on the floor stands. If you can mount them at the wall, I was told a little bit above ear level would be best.
Karsten
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BV4-50, Beosystem 3, Beolab 5, Beolab 3, BV3-32, BV1, BS9000, Beolab 4, Beolab 2000, Beo4 Cinema