Notice that’s a Marvell controller - those are known to not play as nice with Unraid (I’ll be honest, I don’t actually know why, but it’s all over the forums and I’ve experienced disk errors on a Marvell controller myself).

Here is the 2 port SATA expander I’ve been using with zero issues for the last year, for reference. The jmicro chipset is a good option. IO CREST 2 Port SATA III PCI-e 3.0 x1 Non-RAID Controller Card Jmicro Chipset SI-PEX40148 https://www.amazon.com/dp/B07Y92RDKH/ref=cm_sw_r_cp_api_i_RV18QS2DPNY080TVFQ51?_encoding=UTF8&psc=1