@JesterEE - Huh, I always thought the Meshify series was mid-tower at best. That M2 XL does seem better for airflow which IMO is critical for a multi hard drive install.
Right now I'm running an old Antec Nine Hundred that I had the fortune to be still holding onto despite SWMBO's protestations to get rid of my old computer junk. I'm running 2x Kingwin 5 into 3x5.25" hot swap bays. I'm considering getting a 3rd hot swap rack even though I only have 7 hard drives at the moment.
https://www.amazon.com/dp/B081M3RGG8/
Expensive at $300 US, but it has 12 external 5.25" drive bays and is in stock.
Picture of the drive bays.
The Define 7 XL (different case) can hold up to 18 3.5" drives, but unfortunately not hot-swappable/tool-less.