I have been using Racknerd for 2 years. This is for vpn and streaming.
Oracle for more. This is for everything else.
I manage all via cloudflare and traefik(pangolin is this basically with more integrations)
Digital ocean is too expensive. You can also look for Azure and AWS reserves computes...
I use oracle vm. It has enough free bandwidth for my needs.
With plex you wont need any thing. Just machine capable of transcoding like anything above intel 10th gen would be fine. Or gpu. For direct play to mutiple devices tailscale is fine.
The capacitors they use are same as used by cheaper products. Go watch any teardown and search the company. For example one of the company is AiSHi which is chinese and you can look up from there.