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I don't think magnets do much, only use for them would be is on a drain plug so you can see if it has more material deposited on it than the previous oil change, meaning you are about to have a big problem, very rare. Usually need it on a race car etc.
Don't place the magnet on the pan. You are better off placing the magnet on the filter to catch metal debris, then you could dispose of the debris when you replace the filter. Attach a hose clamp around the filter to ensure that the magnet won't fall off.