Onyx in the background

So I have a client who wants to use a PC as a reception computer and wants to use the same pc to control the some LED lights around the office. The lights do work from the pc as they do have all the necessary hardware and software needed to control the lights. I have setup a few cues and trigger the cues by the manager.
The only issue I am having is that I would like to have Onyx open in the background at boot up of the PC. I have figured a way to get Onyx to open at boot up but not in the background.

Does anyone know how I can do this, or is this something that can’t be done ?

If your client is on windows 10, maybe you have the possibility to play with the workspace?