The pizzas we had in Italy with either prosciutto or speck placed the meat on the pizza after it came out of the oven. As you can see in the photo, the speck is crispy because I put it on before the pizza went into the oven. It is absolutely delicious crispy like this. It's also great when used in pasta dishes like carbonara. You can find speck in Italian specialty markets and online--even on Amazon. But, unless you have a deli slicer, I wouldn't recommend getting a large one online. Like prosciutto, speck needs to be sliced paper thin. I really recommend finding an Italian deli that carries it and have it cut to order.
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