In a Beolink Surround setup, you have a supported Beovision TV or soundbar that works as the processor, allowing other loudspeakers to be connected and flexibly assigned to different speaker roles ...
installing 'topper' speaker modules on top of your existing left/right speakers (one set, for a .2 configuration) or to your left/right front and rear/surround speakers (two sets, for a .4 layout). Or ...