For the devices added via ASIC HUB, you will pay in the same way as for ASIC miners in Hive OS ($2 per device, or less if the discount applies).
In your account you can have both ASIC miners under the HUB and ASIC miners with the Hiveon ASIC Firmware. However, any given miner can EITHER be flashed with Hiveon ASIC firmware, OR be connected to Hive OS via ASIC HUB. Hiveon ASIC firmware and ASIC HUB cannot be "combined" in one device.