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You can only have shield a bonus from one source. So you can fight with two shifts but only one of them is going to improve you AC. I am not sure if fight with two shields is allowed but I would not allow that in my game.
There is another long thread about dual-shield fighting where James Jacobs also thought it was silly until someone found two historical precedents for it: A Maori warrior style and an oriental martial arts style. The Maori style looked a little more traditional shield-bashy, while the martial artist used the edges of the shield like a large blade, but it looked to me like they were still blunt.
To the OP: you can also use the Weapon and Shield style Ranger, and just make your weapon another shield. That gets you Shield Mastery at 6th level instead of fighter at 11. The ranger is a little more offensive than the Fighter. I played the (non-dual)Shielded Fighter as a high AC tank for PFS and loved pushing things around the battlefield, but I didn't do any real damage with him until about 7th level. The new size stacking FAQ is also going to reduce his damage, as Shield Spikes and Bashing enchantment will no longer stack officially.