@erik_squires Thanks for the update, I didn't realize that. I am using a grounding type arrestor, I'll check out the isolators. I am using optical between my router and my audio equipment, mainly to replace a 50' run of ethernet cable. Have a plan in place to do the same throughout the house. Would be nice to see optical connections supported on more equipment like modems and routers but realize that it may be a limited market.
Why whole house surge protectors are not enough
TL;DR:
One measure of a surge protector is the clamping voltage. That is, at what voltage does the surge protector actually start to work. Whole house surge protectors are limited to no less than ~ 600 Volts (instantaneous) between a leg and neutral or ground. That’s up to 1,200V if symmetrical.
The best surge protecting strips and conditioners clamp below 200 Volts.
Please keep this in mind when deciding whether or not to use surge protectors at your PC, stereo, TV, etc. in addition to a whole house unit.
I wrote more about this here:
https://inatinear.blogspot.com/2021/09/time-for-new-surge-suppression.html
No manufacturer of whole house surge protection claims that their devices alone are enough for sensitive electronics when you check the fine print.