The Hornady Pistol Bullet Feeder doesn't mount to the press, it mounts to your bench. The product comes with 3 paper mounting templates (depending on your press) to give you a location on the bench to screw on the base, which lets the tubes reach the feed die properly. On the press you use the station just before your seating station to mount the feed die. The bullet feeder spring tubes run from the collator to the top of the feed die...that's the only connection to the press.
There are reviews of the Hornady Pistol Bullet Feeder on this site...just search "Hornady Bullet Feeder".
Mounting the RCBS Rifle bullet Feeder to the AP is another matter.....they say it can be done so I'd ask RCBS or Gavin at UltimateReloader.com On the RCBS Pro 2000, the feeder mechanism mounts to the Uniflow Powder Measure....I'd bet on the AP it mounts similarly. As to mounting on Dillons....it's supposed to...so a special conversion must be included or available.