I also managed to place a Balance two router in this rack. But I had to bend the lateral retaining brackets downwards (into the recesses from which they were punched out at the factory). These seem to be new in the latest rack version and are not visible in the picture of risingconnection.com.au provided by @Marcus.
Are there any suitable mounting brackets to fix the Balance Two accordingly? ACW-743 holes do not fit on the B Two‘s side holes, unfortunately