This will be my last reply to this topic – these things are not as clear-cut as you would like.

The closest I can get to what you want is to say that if you want to turn off your H9, you are best to turn off the power strip feeding the power supply.

A further comment – it is good to plug all of your equipment directly or indirectly into the same power strip. This means that all earths go to the same place, and you can power down the whole lot with one switch. But, don't overload the strips.