I use an appletv. I have the version with a Ethernet port. It plays everything I’ve thrown at it so far and don’t have to endure commercials. The downside is you have to create an Apple account to install apps on it and not all apps are available. It’s also expensive.

Try deluge, it’s been pretty bulletproof for me once configured.

Try using pcpartpicker.com. You can do your build on the site and it will list the best deals for the components you choose. As a bonus it will check to see if there are some glaring incompatibilities at the same time.

I love my ER3 lite and ER-X. I was totally surprised when they came out with a new firmware for it. It’s still beta but it was a relief to know they haven’t abandoned their edge routers.

You could buy a pfsense capable mini-pc ~$200. It will give you, 1 wan port and 2 or 3 lan ports or repurpose an old desktop by updating it with a dual network card. The pfsense mini pc will use a lot less power long term. Then use your routers in access point mode, one for your IOT on 2.4ghz and one on 5ghz for the other stuff. You can set up the firewall to prevent the iot network on the second lan from seeing anything on the primary lan but still have full access to devices from the primary to the IOT network.

Easier solution is what was already suggested is by using vlans with one router and the setup the second router in access point mode for the IOT

If the license is registered to that system changing the hard drive and reinstalling the SAME version of windows won’t be an issue. MS saves your system’s “fingerprint” and as long as you don’t change too many parts, it will recognize it and attach the license back to it.

If you do lose the license on reinstall, there are site that will sell you a cheap license, buyer beware, or ultimately you could switch over to something like truenas (core or scale) to run plex which is license free.