Heya Max,   We don't have much appetite for bad attitude around here. Hopefully our users will treat you right.   Moving on to your question - your suspicion is correct. If you wanted to put your NVMe drives into a RAID volume, you'd need to use a software controller (like a software PERC) to do it. As for hardware RAID vs software RAID, I'd plant myself firmly in camp hardware. I understand that there are merits to both, but I prefer a hardware controller, too.
I know I'm demonstrating my ignorance, I even suspect that perc cards don't support NVMe drives.   Surely hardware raid is better than software(or am I an old man, stuck in the "olden days" when computers had turbo buttons). I know dell servers have bios options specifically for software NVMe raid Even talking about raid and NVMe, am I likely to trigger any "you must NEVER put NVMe drives in raid the idea is STUPID!!!!!"  comments.   
NVMe--- software or hardware raid? (or no raid)