One thing that is worth mentioning is that a single client will have multiple connections passing through the firewall so the more client devices you have the number of connections increases very quickly. Any app or service on your device neds its own connection. For example my computer right now have 38 active connections going through my firewall. Each connection requires resources to inspect the traffic and apply any rules whether they are access or QOS. Well done for reaching out since you weren't sure, the last thing you want to do is underspec and end up having to replace the unit.
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