This little switch right here: Netgear 4x PoE can deliver 30W per port. That’s nearly 2 RPI 4’s running at max draw (which is a very rare use case)
So, if you you only run 1 Pi on each of the 4 ports, you’re only using 50% of what the switch is capable of “safely” delivering. In other words, you have an 50% safety margin.
Edit - Sorry, I jacked my math up, was using the minimal draw of the Pi Only.