Surge Protection for Line Voltage LED Fixtures
First, if you put a whole house surge suppressor on a single circuit, I won't tell :) 

The biggest issue I see is where to put such a device. You can't stick it just anywhere. It would offend aesthetics to mount it on the wall surface, and you can't bury it inside the wall.  

If you have a multi-gang light switch and you're willing to sacrifice a switch position, it might fit there.  

It might also fit up in the "can" of the LED light.  

When hooking up a 120/240V surge suppressor 120-only, follow the manufacturer's instructions. 

With LED durability, it's all about the electronic driver.  The finest, most expensive light won't stand a chance if they went with a cheap Cheese driver off Alibaba.   On the other hand, drivers are commodities and are not that hard to replace.   

When I want extreme durability from LEDs, I use 12V or 24V LEDs (which have no particular electronics on board, just a dropping resistor) and any expendable, swappable, commodity 12/24V power supply, which I expect to fail from time to time (unless it says GE).  This has the added advantage that it plays extremely well with DC backup power systems.