Slowpitch Plate Umpire - Stance with a mat

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Anyone know if there is a preferred way of setting up when using the perverbial strike mat instead of calling the zone? Remember, you're just calling balls & strikes based on whether the pitch hits the mat or not.

Now I suppose this could be a personal preference, which is what it appears to be, but is there any organization that has a preference on this?

Personally, I like to be behind the batter, kinda in the slot, but the catcher 9 times out of 10 is behind me. This gives me movement with a little cheat toward 3rd base.....where I'm supposed to go after the ball's hit.....but that's me..............guys are all over the place.

Give me some wisdom please. I'm trying to write some home league mechanics for our untrained umpires.