I have smart plugs from Innr, Samsung, Aqara (I think) and have never experienced the problem you’re speaking of. Mine are all ZigBee – not sure what yours are.

That said, I just got a bunch of Shelly EM Mini G4 and put them in some PowerPoints and they work great.

If you don’t mind some basic wiring they’re easy to set up.

https://youtu.be/L3LbxDZRgA4

Not really with the same flexibility.

You only get usable capacity of the smallest disk in a vdev or you have to add a new vdev with your newly sized disks.

Unraid lets you mix and match however you like and get all the usable capacity (as long as your parity is your largest sized disks).

Nym looks interesting and I hadn’t heard of it before, but based on my reading I wouldn’t say it supports wireguard.

It implements wireguard but it still looks like you need to use their client instead of a vanilla wireguard one.