Long ago I realized the easiest thing to do was mount a power strip inside your stand/cabinet, so you can shut everything off with one switch.
I did just that! However,, I change the water 3 times a week. I only clean the canister ever other month. With two on a tank, one this month, one next month. What is surprising is that they aren't really that dirty even going two months. Gravel vac once a month, either the whole tank as well as can be done without disturbing the decorations, or half the tank deeply with the decorations removed.
Too lazy to take all the decorations out at once.