16 channel gateway

Greetings everyone,

I am looking for a piece of info, trying to check on several other forums. Perhaps anyone can advice here. I am trying to upgrade my custom built LoRa gateway from 8 channels to 16.
I have seen couple of similar posts on this forum already, but with no final answer.

I have 2xRAK5146 SPI and RPI. Im using RakWireless forwarder build on Raspbian.
From physical connectivity point, it is clear: I will add second concentrator on another SPI slave, but what about the forwarder service itself?

  1. Do I need 2 forwarder services, one for each concentrartor?
  2. How about Gateway ID, can I put identical ID for both?
  3. Is there any tuning to be done in global_conf.json f.eg? I see there is SPI declaration there, is it accepting array of SPI devices? Like spidev0,0, spidev0.1…
    "SX130x_conf": {
        "com_type": "SPI",
        "com_path": "/dev/spidev0.0",
        "lorawan_public": true,
        "clksrc": 0,
        "antenna_gain": 0, /* antenna gain, in dBi */
        "full_duplex": false,
        "fine_timestamp": {
            "enable": false,
            "mode": "all_sf" /* high_capacity or all_sf */

Appreciate your help