Concert Tickets Question?

Well im going to try to get tickets for two Rammstein shows in California. I want to get GA Pit on both but they go on sale at the exact same time and the floor will probably be gone immediately. I know I can use two computers, each on another ip adress, but do I have to use a different visa card or Ticketmaster account? And if I'm on one computer can I just use a proxy on a tab? Thanks in Advance. :D