Safe for what? The Z3, the user, the home?
At least it is quite common to have the Z3 somewhere in the internal Home-network. Placing it in a DMZ would be the perfect solution for me, but the typical home-user doesn't even have a DMZ and places it directly into the internal LAN which is also ok.
If you found this post helpful, please give it Kudos. If my answer solves your problem, please click Accept as Solution so others can benefit from it.