Even if your login page is not easy to break, it will be indexed by robots or hackes in their list. And they will test on it every vulnerability that will be published for any DSM component. Using VPNs like ZeroTier or Tailscale is definetly MUCH more secure than all of those tweaks and easier to setup too.

But offcourse its YOUR data so … good luck :)

Can it monitor containers or some files?

So far youre the only one who fully read/understood my question. The rest mostly just recommend what they use. Which is also fine, yet these not answer the issue. Thank you!

Ive seen people building whole houses from empty bottles. He could do the same with those phones. He would end up with true “smarthome”

What if they dont ring but start to lockpick/bash your door right away? :D