You can use the AP beacon for the same purposes as battery beacons, so proximity or location beacons. Just take into account that you typically can (or will) not easily position or move your APs for BLE accuracy.
With battery operated beacons it's much easier to place them at the best position for location.
In addition, you can use the AP beacon for beacon management when connected to Meridian. You will get battery status and 'last heard' information in the Meridian dashboard and can even do some updates to power levels for proximity beacons remotely.
Because the battery beacons and AP beacons have different properties, like in where they are mounted, antenna patterns, it's in general not recommended to mix AP and battery beacons in the same area.
Your local Aruba Sales team or Aruba SE can help you to get your questions answered and prepare a good design.