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Why do you "need the servers to be in very close proximity" in a retail store? It's not high frequency trading

Poor connectivity to the internet?

Given that AWS Outposts behave badly without connection to mothership, well...

Why do you want it close then?

Purely local latency?

For some customers, I imagine this will start off as an emotionally-driven request...until they see the price.

https://news.ycombinator.com/item?id=29398880 summarizes it best when it comes to my answer :)