I believe amazon will see the NAT address of either dongle, depends on the one you using of course and your laptop as opposed to either of the virtual mahines your running.
But im not completely sure, it might see that of the virtual machine your using, each installation having its own mac address, with each dongle having its own, no problem.
But in either case, its better to be safe than sorry and it would be really easy to spoof your laptops mac, so why not have a different spoofed mac address for your laptop for each set of virtual machine/dongle you will be using!?
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