I've built my Velocity that way before too. It does indeed work, and work well. It gets plenty of air across the center since the side airflow from both sides has to pass over the coil on its way up to the drip tip. Plus you have the secondary air holes on a Velocity to supplement. On a bottom airflow rta, I could see the center section being a bit of an issue, but even then not a major one.
It's especially useful with DNA40 devices and that cursed 0.1 ohm limit, when you really want to run a functional (functional=doesn't take all week to heat up) nickel build in a "dual coil-only" atty, without resorting to 30ga wire.
(Not my build there, just illustrating the point)
It's especially useful with DNA40 devices and that cursed 0.1 ohm limit, when you really want to run a functional (functional=doesn't take all week to heat up) nickel build in a "dual coil-only" atty, without resorting to 30ga wire.

(Not my build there, just illustrating the point)