[Mike Simonds]

I'm assuming you are running with a 5 man crew.

In our mechanics, we position the BJ back with the receiver favoring the HL's side. LJ will stay on the line until the snap and then move down field (how far down the field depends on the ability of the kicker, game situation, etc.). HL will hold the line until the kick crosses the neutral zone and then move down field. R watches action around the kicker and protects the kicker. U will be in his normal position 5 to 7 yards behind the defensive line of scrimmage, protect the snapper and watch line play.

As an umpire myself, I position myself no wider than the offensive guards and if possible between two of the linebackers. At the snap I hold my position and just let the players go past me as I turn towards the line judge's vacated side. When the action as passed me I will then pivot towards the middle of the field and only if its a long kick will I drift down towards the ball.

I think with proper positioning and good awareness the umpire will not get run over on a punt play.