Yes, the tapered lugs will help seat and center the wheel. Its not as perfect as being hub-centric, but it works well enough. FYI, from some quick googling it looks like most alloy wheels are manufactured hub centric and steel wheels lug centric.
what he said! its because softer metals deform easily, so they are hub centric, and steel being more dense and less prone to deforming get lug centric, but with spacers most would recommend hub centric regardless of wheel type, that way u can decrease the chance of unwanted vibrations in your wheels and drivetrain
2003 WJ Overland, 4.7HO, D30 & D44A (1 tons going in now!), RC Long Arm, lifted 4" Front 6" Rear, RC 2.2 4" Shocks, JKS track bar, custom hi-steer, 35" Procomp M/T's on JK rims, beefed up Overland rock rails, custom skids and dif gaurds, Rugged Ridge 8500 synthetic winch in custom hidden mount