Nick_J:

My end goal will be to run on a device like an raspberry pi 4, jetson nano or something similar (min 4 CPUs, possibly GPU will be available).


You can also plan to use a Coral device/accelerator. See the benchmarks at:

  
      

      Coral
  

  
    

Models - Object Detection | Coral 3

  Models that identify multiple objects and provide their location.