Don has an Asus router and he has a USB in for connecting an external drive to it. Can he put a hub on it? Leo says sure. He can take up to 255 devices on the USB chain, but it may confuse the router, so he should look at the settings to see if it will support it.
David has a home theater system and the speakers are already built into the house, but he needs surround speakers. Leo says he can do that and then just wire them into his home theater system. It'll be the rear surround in a 7.1 Dolby system. Or, if he doesn't want to do that, he should just go with Dolby 5.1. He'll be just fine with that. He'll need to re calibrate, too. Of course, he could go all in and do Dolby Atmos at home, too.