Easy metrics dashboard for multiple systems?

I'm looking for a simply solution to monitor all my servers and systems using a single dashboard. I want to see metrics like CPU usage, used RAM and storage to see if something is wrong.
I just set up Node-Exporter, Prometheus and Grafana but haven't found an existing dashboard that shows multiple hosts at once. Now I looked into Checkmk and Zabbix but I feel like both are a little overpowered for what I'm looking for. Do you have any recommendations?