My experience with power nailers — the .22 caliber kind — in concrete is that you get too many blowouts, especially if you happen to hit a large bit of aggregate. I wouldn’t expect an electric power nailer to do any better. And even if the nail goes in clean you’re left with a nailhead that’s proud of the surface such that it’ll catch a shovel blade.
Those two conditions led me to switch to the Berntsen 1″ disks. Scribe a cross at the point, drill the hole as close to centered as you can, install the disk, reproduce the point from the scribe marks, and punch the disk. You have 1/2″ to play with in all directions, so even if the drill wanders a little you’re still on the disk.