Ps3 – Playstation Plus Instant Game Collection on same device, from multiple countries

After much searching on the Rock Band forums, I found this post which seems to confirm that it is not possible on PS3. So only one account can be achieving goals at a time (although you can choose whether you want to have multiple people achieving goals for that one account).

Unfortunately, you can't do that directly off the PlayStation Network Store, since the buy option won't be available for games you own through PS+, only after your subscription has expired will that option be available again.

However, you may be able to purchase the full games through third party sources. For example, GameStop offers download codes for PSN games that can be redeemed on the PSN Store. I assume that if you redeem a code for a game you only "own" through PS+, you'll own it permanently (you can check the game's information in the XMB and see if it has an expiration date).

I cannot confirm this method 100% as I haven't tested it myself, so try at your own risk.