Two Dots and three tp link plugs here, no hub.
Dot one is connected to a proper hifi and plays spotify.
TV and apple box/sky etc is on a TP link plug so “Alexa TV on/off” works nicely and its also set to turn off at 1am to avoid stand by power use. That plug also has a power consumption thing which is vagely intresting if you like that sort of thing.
Outside security lights are on another plug “Alexa outside lights on/off” also works nice.
Outside sitting around type lights are in a seperate supply “Alexa Garden lights on/off”.
Upstairs Alexa gets used for radio/controlling lights/setting alarms and asking silly questions. I think I need another for the kitchen for easier use if lights and music in there.
They do listen in but dont care really, I have nothing to hide could even be useful.
Dots btw have a line out which I prefer for music.