still steam prevents you from running more than one game at once from one account. can’t start vampire survivors on the deck and play manor lords on the other pc using the same account. family sharing and using multiple accounts should work, though 🤔
if you need more reliability you can always use a second mailserver as backup, add a second mx record to your domain and if the first one is not responding the second one will be used. there is no limit of how many next servers there can be specified afaik.