All the suggestions you’ve made have already been discussed elsewhere in this forum. I’ve linked a couple of topics below and attempted to clarify some of your misunderstanding of network security.
I hope this helps. Anyway, the GlassWire team will probably have something further to say.
Intrusion and MAC address blocking?
Once your local network is breached you lose most of your network security.
An intruder can access your local network in three ways:
- using a cable to connect to your local network (i.e. at the router).
- connecting to your wireless network by breaking your wireless security which usually means guessing the password.
- connecting remotely from the Internet through your router by breaking its security which again usually means guessing the password.
In all three breaches, your router is the focus for the intrusion. It is also the best place to control security. That’s why the GlassWire team have been talking about potential solutions that work with the router but a few years on there is nothing concrete that has been advised to us users See Feature - Install on router
MAC address blocking might slow down intruders but it will not stop them if they are already capable of gaining access to your network. See the discussion of MAC spoofing and Cloned Routers
Hiding your device?
There is no practical way to completely hide your device on your local network. How quickly it can be discovered depends on how your network has been breached and how it is configured. To hide a device on your network you would have to hide it behind another device such as a router/firewall or a proxy such as a VPN, e.g.
If you meant hiding wireless SSIDs then that also doesn’t provide real security either, i.e. https://www.pcworld.com/article/2052158/5-wi-fi-security-myths-you-must-abandon-now.html