Only problem with two surge protectors is if you are using a GFCI outlet it will not trigger it running both as it is a redundant system. I ran into this problem when I went on vacation and had a water incident. Because I was using two surge protectors when my overflow box broke off and the water came up and over the top of my tank and landed all over my hardware it only tripped the surge protectors instead of shutting off my GFCI outlet. That outlet had one of my apex power bars plugged into it and had my main sump pump plugged into it. So when my apex module got brought down from the water it left that pump running. Because of the redundant surge protectors it didn't trigger my GFCI outlet that would have shut off all the power on that line. So instead of tripping the GFCI outlet the sump pump kept running dumping over 100 gallons of water on the floor and all over my hardware as it splashed off the wall behind the tank. When my Apex module got shorted out my apex power bars attached to the GFCI outlet reverted to normal power bars and they kept running instead of being shut down. If I didn't have the 2 surge protectors this would have tripped it cutting the power. So in the end it ended up causing more damage then it would have if it would have tripped. I took the second surge protectors off needless to say after that and will not run two. I learned from that experience that is for sure. Just some food for thought.
