Two devices to use the same MAC of a computer for the DNI to make MQTT work?

I am trying to use two SmartApps which use a device, and that device has a Device Network ID of the MAC Address of my server.

The problem is that the DNIs have to be different, but if one of the DNI is not what my MAC Address is, then the smartapp doesn’t work.

The two smartapps I’m talking about are the Lutron Caseta Bridge and the MQTT Bridge.

How can I make this work?

I have a very similar problem, did you ever find an answer. In my case I have 5 device all running on a RasPi.