Usually we put the tv on a tv cabinet or stand. As for the sound system, if it a HiFi, we need to have some space for the HiFi and also for the few large speakers on the left and right… and front for the sub-woofer.

But to save space, why not have tv stands which also house the speakers… including the sub-woofer…  that will save some space and some messy wiring… and the living room will be neater… need to do some radical design to accomplish this…