In HiveOS you can run two separate miners on two algos. Just have to identify the cards based on the miner’s commands. Some you can number, some you can just identify AMD or Nvidia.
For the moment that is the only option in HiveOS and even in Windows is the only option,you can run multiple instances of the miner,just edit the script that runs the miner and add your GPU-s for example Gpu 0,4,6 just making up that they are Nvidia cards and Gpu 1,2,3,5 AMD cards,you have just two simple scripts,run them simultaneously and this is how you can mine different algorithms with different cards and with different miner instances.I don't know any other way around this.