What are the best options for safely mounting a Hi-Lift Jack in a Wrangler?

A lot of people I see driving Wranglers around Denver have a Hi-Lift bolted on somewhere, bumper, back door hinges, etc.
What's the best option for a properly and safely secured Hi-Lift? I don't want to be drilling holes. And by properly secured, I assume not just thrown in the back of the Jeep, either.
I think the best I've seen so far is this http://www.quadratec.com/products/92200_9001.htm mounting on the back of the roll cage, where the jack is actually inside and so won't get dirty/rusty, driven into or fall off.

- David Mallinson, Denver, CO, USA (via email)