I have been using Adguard Home in the cloud, limited by clients and using it only for DoH/TLS. Updates are made directly in the UI, it's really very light and practical.

fastpipe.io is closing down!

you can generate a new cookie with the value you want to identify that computer and use/capture that same value in the plausible custom event

In Plausible you can use custom events: https://plausible.io/docs/custom-props/introduction

I think this should be enough

use installed on edgerouter-x, no problem, efficient and functional

Using a fly.io free tier

https://noted.lol/easy-off-site-monitoring-with-fly-io-and-uptime-kuma/

it wasn't a criticism of your project, it's just a layer of security for these companies. you asked for a raise and they apparently responded promptly.

In general everyone should use 1-2 servers, 10 is not exactly a low number. Even in the most boring players like AWS, using 1 month and paying the bill will already give you higher limits.