Frodo, John makes great videos on how to maintain his wife's Boxster. My favorite is his coolant flush done the old school way. I can see why you're not sure you agree with me. Let me explain.
I think there's been some confusion on what I said about the yellow arrow so let me clarify. I am not saying do not use the right reinforce steel part of the frame in the front.
What I am saying is do not use the point where the yellow arrow is pointed (line indentation) at in the 101 Book if that makes sense? That part is not strong and it will bend. For those that haven't watched John's video, he clearly states the front of the reinforce steel part. Brian Minson recently video also shows you about this as well. AsXDoesStuff is the first video I watched on how to jack up my Boxster as he shows you how to use the scissor jacks with a low profile jack.
But in general, watch Neil's way of jacking up the car. I like to use the rear jack stand points to jack up my front than the reinforce bar in the front because I don't have enough clearance room because of my bulky jack.
https://www.youtube.com/watch?v=La6i3TwMB8k