My wifi AP has been next to my spiders for over 1 1/2 years. I have had no adverse effects that I could notice.
I doubt if it will have any effect.
This is only my personal experience.
Only thing I've noticed is that my wifi signal weakens considerably when I use the microwave oven which is about 3 meters away on the other side of the wall.

But that has nothing to do with spiders.