https://www.amazon.com/gp/aw/d/B00M2DDO0Q

This will do up to 5 at a time

However you shouldn't need new hardware for this. Wire the panel up to your 48 port managed switch that's running cdp or lldp (which you have, of course, right?) and go around with your laptop, a sharpie, and either wincdp or winlldp