how to minimize hdd spinups?

I have a mdadm RAID 1 of two Toshiba MG09 18Ts in my pc but I don't need to access them very often, maybe 1-2 times a week. I'm booting the pc once per day which also spins up the hdds. When using a systemd service to put the drives to sleep right after boot they sleep until they are accessed, or, and thats one part that annoys me, when I'm shutting down. Is there a way to prevent spinning up on shutdown? I have also read about a SATA feature called "power up in standby" / PUIS to not spin up the drives on boot but from the hdparm -s description I'm unsure whether I could actually use this. Using the latest kernel the OS should support this feature. But I couldn't find any info on whether the drives or my mainboard (Crosshair VI Hero) support it. Is there a way to safely check if this feature is supported?