With that much tread it will be fine, however it's always a good plan in general to put new tyres on the back if replacing in pairs as they get less load through them and bed in better on the back as they're not getting scrubbed through steering whilst they're still soft.
When you then swap to the front they will last longer. Usually with Quattro if you rotate the tyres once half way through their life all 4 wear out at the same time anyway.
The safety argument above is correct - better for handling balance under braking but if an older tyre were to fail it's better off on the front so you get understeer rather than oversteer with a flat.
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