Here are the installation instructions and specs for your house surge protector.

https://download.schneider-electric...2551_warranty.pdf&p_Doc_Ref=NVE82551

That's a heck of a unit and you can definitely trust Schneider Electric products. Unfortunately, the VPR is still very high.

The Panamax will protect from high and low voltages and lower the VPR by 100V as a bonus. But the house surge protector will take the majority of the hit.

And yes, the Panamax makes far more sense than the Furman.