Sorry if this is the wrong place to ask.
I am trying to build a DAS, or something similar to a QNAP, with spare parts and things I have. I have 4 4TB hard drives. I am connecting them via SATA to a USB C 3.2 to SATA adapter (https://www.amazon.com/dp/B0DHRSSHJB?linkId=a7d614b4ea73cee11d91c4bb59c5890e&language=en%5C%5C_US&ref%5C%5C_=as%5C%5C_li%5C%5C_ss%5C%5C_tl)
Not sure if anyone has used these in their setups or have experience with the JMB575/JMS580. But whenever I connect more than two drives, it is as if it cannot sync the drives in RAID and write speeds go from about 300MB/s to about 40MB/s. The drive lights do not come on at the same time and blink rapidly telling me something about these adapters are not suitable for this. This happens with two different adapters (2 drives per adapter), all 4 drives on one, both adapters plugged into different USB C ports, etc.
Does anyone know of a good way to accomplish what I am wanting? I have the drives powered, I just need the data cables connected. Ideally all going down to one USB C cable to connect to anything.