You will be responsible for maintaining the security of your own tokens.  An ERC20-compatible wallet is required for storing the EVN tokens.  You can choose a software or hardware wallet, it's up to you. 

Your rights to the dividends of the mining profits are embedded in the smart contract of the tokens with no expiration.  As long as you hold the tokens, your payment will be automatic.

The payout will be made in ETH into an account of your choosing.  Again, you are responsible for the security of your wallet.

Envion will have outside auditing by one of the Big Four auditing firms to monitor our operations and make sure your investments are handled in an appropriate and transparent manner.

If you are asking about physical security, we have described that in this comment: https://bitcointalk.org/index.php?topic=2348435.msg24223118#msg24223118