Due to part luck and part perseverance from a colleague I somewhat quickly ended up with several servers. My original plan was to purchase just the one, but these things have a way of going in different routes, so four(-ish) servers later, I now have a small stack of nerd-slabs sitting in a corner of my house.
As I have not yet been able to find a good enough rack for my needs, I have been simply stacking them up on top of an old kitchen counter top, which itself is raised off of the ground by two layers of bricks. I have gone decidedly DIY on this approach, but I would prefer to keep it simple until I find a good enough rack option, and this is what I had available to me.
A while ago I stumbled upon something Homeplus (a local large mart) that basically amounts to rubber strips meant for shock-proofing.. something. I thought that these would be a great fit for placing under the servers to separate them from one another, and perhaps reduce vibrations a bit, although I'm not really all that concerned about that. I went ahead and brought two of these rolls back and went to work cutting them up.
Installation was, as you'd expect, very easy. I simply put down four of these strips (flat part facing down), and put a server on top of it. The result is a small but noticable gap between each server, and because each strip isn't very wide nor long, a lot of surface area of each server is exposed to air, which if anything, shouldn't hurt them.