I can confirm that this works from the UK. I had a USA 360 account anyway, and registered with Raptr and linked it.
The, whilst using a proxy to trick Raptr in to thinking I was from the US (I use Proxy Switchy! for Chrome), I was eligable for the reward.
Signed up for a free month of Gold on the USA account (using PayPal), then cancelled the auto renew. Accepted terms for Raptr, it saw me having Gold, and gave me 2 codes for the games.
Log in to UK account, redeem codes, done.