Home use robot weed killer / puller. Does not need to be fast, but does should not need manual moving for each square foot. Although, if it was fast, I could

Home use robot weed killer / puller. Does not need to be fast, but does should not need manual moving for each square foot. Although, if it was fast, I could drive it like a lawn mower speed that (even as slow as 1/4 pace) would be acceptable.