Second Play in Infield Positioning

[njdevs00cup]

I've got the plate and need some help on this one! I told my partner during pregame I would take the second play in the infield at 3B.

R1 @ 2B, w/ 1 out. Batter hits a ground ball to F6, who looks R1 back to 2B. R1 breaks to third on the throw to F3. F3 catches the wide throw and attempts to make a sweep tag and misses. BU calls the R2 safe. F3 throws to F5, a very close tag out on R1(I made the call). Defensive manager asks BU to ask for help on the tag @1B. BU asks for help and I have the batter safe as well.

My question (after this long winded scenario) is where is the proper position for the plate umpire, when the ball is hit? I came out to the top of the circle to watch for a tag and pivoted toward 3B on the throw.