Most everyone here will never open that drain plug. We use a flush and fill method by disconnecting the hose, adding a plastic line to a container and drain off 2 quarts at the same time adding 2 quarts from the dip stick pipe. If you do this 7 or 8 times, you get a full flush and never need to drain it through the plug. Anyway, draining by way of the plug only gets a very little amount of the ATF out. The oil pan drain plug would be the place to install the Fumoto plug you mentioned.
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1998 S70 T5 Emarald Green Metallic, 2004 V70 2.5T Ruby Red, Previous Owner of Black '94 850 Turbo Wagon. My cars have been running so well lately they've got me worried.