If you modify the beer tube inside the keg, you can lay the keg on its side. This involves removing the tube, shortening it slightly and bending it so it touches the side of the keg rather than the bottom. The keg would lie on the rack with the beer connector on the bottom. Then, you'd have to put something on the racks so the front (top) is slightly higher than the back (bottom).
You can't just rotate the tube, as they are keyed in position.
If you are careful about the mod, you'd still be able to use the keg standing up later.
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