Syncing is on or off across the entire account. You cannot pick and choose which devices will sync that are on a single account. If you have 8 devices on the account, and each device has the same book on it, when you open that book it will check with Amazon's servers to see what the last location read is (this is assuming that wifi or 3G is enabled at that time).
You can choose what books go to what devices, though every book purchased on the account will appear in the archives of all of the devices.
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