I'm from Portugal. I'm not aware of any difference regarding that word in particular, but tbh I wouldn't know. I'm always surprised with some of the differences I find from time to time.
I can tell you though, that using the word "periferia" is actually common in some place (although a bit rare in most). It's mostly used as a synonym for 'around the borders'.
The example you've mentioned:
"move the burgers to the periphery of the barbecue", actually seems perfectly fine. It seems a little bit over-detailed, I guess that a bit context-dependent but I wouldn't bat an eye to the equivalent of "move them to the periphery".
From what I recall 'periferia' is also commonly used in TV news.
I can tell you though, that using the word "periferia" is actually common in some place (although a bit rare in most). It's mostly used as a synonym for 'around the borders'.
The example you've mentioned: "move the burgers to the periphery of the barbecue", actually seems perfectly fine. It seems a little bit over-detailed, I guess that a bit context-dependent but I wouldn't bat an eye to the equivalent of "move them to the periphery".
From what I recall 'periferia' is also commonly used in TV news.