

On the mini PC set up a homepage in Firefox that has links to all the streaming platforms and stuff. I use Heimdall but there’s many others out there and a lot are probably better. You can just use a browser homepage addon, really.
Get a dongled mini keyboard to use as a remote.
Remove password login from the PC, set it up to auto update every now and then at night when it’s not in use, and forget about it.
If people in your house can’t use that instead of thebaked in apps then they don’t deserve the Wi-Fi password.

As a CCTV enthusiast, I do not generally recommend ubiquiti cameras unless the person wants to wholly live in the unifi ecosystem.
They’re very pricey for what you get, even though they are pretty good. They’re most often not even near the best in class despite their price, though (looking at you, doorbell camera)
They also don’t play nice with open/self hosted NVRs. It’s getting better due to consistent demand, but the reality is that they’re at their best when you use unifi protect, on unifi devices. So IMO it’s all or nothing, and since there’s a lot better value in other brands, I choose not to use them anymore.
They’re pretty user friendly, though