When the engine is raised it looks a lot better on the top. But it is possible to get it from below - with just the right tools. I've done it with a swivel head racheting box wrench. I would think a swivel head rachet would work too. But the problem from below is that your working at such an angle, and with such force, that the wrench or socket wants to twist off the bolt head, which can be controlled by wedging something between the wrench/socket and the engine - also a pain. And there's a very narrow angle to rachet - probably 6 or 8 degrees. Better to work from the top and rig up a lever.