I work in a distribution center and there are computer stations all over. We have power strips with six spaces secured to the tables. Someplaces have one plugged into another. I say this is ok. They are individually protected as labeled at 15amps with built in circuit breakers. The main breaker is a 120v 20amp circuit so if there are two power strips together if the amps get above 15amps it has two chances to protect itself. What do you think about this?