Creating a secure NEM NanoWallet using Trezor is a great way to protect your funds from any nasty hackers out there.
Also your Trezor NEM Wallet will make a great co-signer to any multisig wallets you have as even if a hacker gains control of your computer and manages to get access to your NanoWallet to send funds from a multisig account, he will be EXTREMELY unlikely to also be able to get access to your Trezor account and cosign the transaction!
Plus the Trezor will also store your Bitcoin, Ethereum, Dash plus many others including allowing super secure access to your ERC-20 Tokens stored on MyEtherWallet.
Getting a Trezor is really a must have for anyone serious about investing in crypto currencies
How to Secure NEM NanoWallet with Trezor:
https://www.youtube.com/watch?v=nPi7Xzn5Tq0