I kinda wanted to try myself. I'm a novice hobbyist, and I need to start somewhere.
And dabbling in the mains is exactly the wrong place to do that....
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Those stickers are there for a reason. No devices are 100% reliable, but at leastsome have been tested.
In the condo I live in, the previous owner installed everything himself [this is obvious from the mistakes I found] in addition to painting the place, etc.