Tim,
I would go at least a 3 space to allow for sufficient air flow. I had my wt-800 in a 2-space and it had a tendency to overheat. The other option is to add a rack fan to the 2-space to keep air flowing.
I'm in NYC and have a 2 spacer that's just sitting around. I'd be willing to sell or trade it if you think that you can overcome your ventilation issues.
I have a 4 space Roadready that I am not using. It is the shallow one so it would be just long enough for the Eden and you would have room for ventilation. I carried my Sm-900 in it until I sold it.
Sorry I did not even realize this thread had responses
My Eden's fan is in the back so I don't think I would need extra space above it..or would I?
I've never used a rack in my life so I don't really know...aren't they all open in the back?
Otherwise a 3 space might be the ticket..4 is too many, I don't want to carry all that and own zero rack mounted hardware and don't really plan on getting any