Mental Ray standalone will run on Linux, but I'm not sure how that works when you need to render a Max scene. The way most people usually set up a farm for Max, you'd need Backburner Server and the 3ds Max executable to run. They both reference Windows DLLs. Backburner Manager needs to be running someplace as well. I think your best bet would be to try it in a Wine environment. I've never heard of anyone doing that, and trying to render in an emulated environment sounds like asking for trouble, but it would be interesting to see if it works.