I am from China, I am pro on deploy or write proxies
I was formal emoloyee of baidu(China`s google)
you mean you want pretenting multiply person buying something such as sneakers
that is another thing
I have experience buying something like flash sell online
beating 10k people who wants it
that is quiet easy if you do it yourself
just deploy a virtual machine with a browser to the nearest location to the target website
a company sell the service would be like running a remote desktop service