It doesn't need to be your wifi devices, it could be your neighbor's, if you're in a townhouse or your house is close enough. But I agree with another commente

It doesn't need to be your wifi devices, it could be your neighbor's, if you're in a townhouse or your house is close enough. But I agree with another commenter: if they've hacked your wifi router then you have bigger problems, as they've likely hacked all your devices then.