With the Q990C, you can position the satellite speakers however you like. The system itself senses whether they are at the front or the back...

There is a setting in the Smart Things app to configuer if you're using them as front or rear speakers.

I am also interested in purchasing an HW-Q990C system and I'm not sure if the previous question has really found a suitable answer: Reading the contents of the box, you don't really know if surround speakers are part of the deal. The description actually mentions "rear speakers". But further on in the specifications, under scope of delivery it only says 1x Samsung Soundbar HW-Q990C, 1x Wireless Subwoofer. It leads me to believe that there are no surround speakers with this offering. Really unclear, in my opinion.

Thank you for your reply. I've learned one more thing

Thank you for your reply