Is there any update on the best way to integrate a 218 into a 861v8 5.1 system to get full MQA from front 7200SE?

At the moment all 6 DSP speakers are connected as a home run back to the 861v8 with the left 7200SE set as master. Presume I need to change this so 861v8 speakerlink left goes to 218 and from 218 to 7200SE left and from there to 7200SE right?

What happens if both the 861 and the 218 are trying to send signal to speakers at the same time, seems a recipe for confusion and problems?