I don't think the above suggestions are bottom feeding.
My experiences with bottom feeding RDAs are only with my Reo, but so far the Reomizer 2.0 is the best RDA for bottom feeding. The Vicious Ant Cyclone is nice too, but you have to specify to get a bottom fed version. The A7 also works as a bottom feeder. It has some issues with the Reo, but it might work on the Aurora.