I am not sure about the foot placement. I am of the opinion you should do what's comfortable. I think there is very little difference as far is how it targets the leg muscles. Just my take.
As far as back injury, I believe that occurs when the butt leaves the seat at the bottom of the press. Based on my observations this is a not uncommon gym goer mistake and a risky one.
Zdravko Veselin Gaeta
I am not a powerlifter nor am I a bodybuilder. I just want to be big and strong.
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Make gains, not excuses.