The product you linked is a cheap fanless 10G layer 2 switch. It’s ok for the price, as fanless 10G enterprise switches are hard to get used.
There are suitable 10G capable Mikrotik routers however. This one, for instance: https://www.amazon.de/MikroTik-RB5009UPr-S-IN/dp/B0BBW159WW If you want wirespeed 10G routing on two or more ports it’s going to get expensive and/or noisy fast. A good compromise is a single 10G port router in a router on a stick mode used with a cheap 10G layer 2 switch.
You need at least one 10G port which is a pain on the Lenovo. There is a 10G passively cooled Mikrotik with sufficient power available.
Without VPN, they can.
Reddit who?
Do not expect to find facts on Wikipedia when the overall propaganda volume is deafening.
This war started more than a decade ago. Russian Federation only became a party some two years ago.
The next target after Russia loses against NATO will be China actually. And then Iran, North Korea. But you’ll get a total nuclear exchange well before, so it’s academical.
So likely next proxy is Moldova, Romania, Georgia, Belorus. Poland is also a possibility, but not at first. Unless Belorus, but then we’re at tactical nukes stage already.
The conflict started more than a decade ago. Currently it’s a proxy war mostly limited to the territory of Ukraine and Russia. Other countries are in the pipeline.
What does “win” even mean? NATO starting World War 3? Well, they’re getting there.
What’s a ‘reddit’?
https://wiki.debian.org/ZFS has nice docs. I would practice in nonproduction first if you’re unfamiliar with zfs.
No hardware RAID. Use zfs, if you can. Mirror the boot SSD. I would use a stripe over mirror and 4 HDDs. Two drives are not enough redundancy. Use enterprise or nearline drives, if you can. Debian is great, you can install Proxmox on top of it, but from the sound of it plain Debian would work for you.
NATO/Russia 3rd world war, still reasonably limited to just two countries, for time being.
Neither 10G multiport routers nor L3 wirespeed switches are low power. We’re looking at 100+ W to multiple hundred watts. In 1U these are rather screamy.