If you keep bitcoins at a wallet, it's very high risky to deposit the bitcoins from your wallet to any exchange as long as the replay protection is not added after fork. Adding replay protection may take very long time, e.g., a few weeks or a few months.

Usually, the coin price will drop quickly after fork. That being said, you will loose a lot of money compare with keeping coins at a third party exchange. Because the bitcoins in an exchange can safely claim bitcoin2x very soon and it is able to trade within a few hours after fork, even if the reply protection is not ready.

I recommend you guys keep bitcoins at an exchange in order to have an earlier bitcoin2x claim, and sell earlier than who keeps coins at a wallet.