How to attach christmas lights to wooden fence without damaging the fence

As in the title. I tried outdoor command strips but because the wood in this weather is never completly dry it just comes straight back off again... The fence is solid so I can't just tie some wire around it.

The only thing I can find is cable clips but I would have to hammer them into the fence which I'm not too keen on!

I know you can get clips to attach to a roof or gutter, is there anything similar out there for a wooden fence?