My go to
5 port switch is the Netgear one. It comes in a metal case and will manage an accidental smack in the pits.
For the robot you could use
this 5 port switch that works on 5 volts. It's in a plastic case and is much lighter than the Netgear one.
Note, both are 10/100 switches, but it's unlikely you'll need gigabit speeds on the robot or in the pits.
