Yep I agree - don’t worry about losing SATA ports on your motherboard, use those M.2 slots instead. You can get better features with add-on cards anyway - here’s the card I’m using for extra SATA ports and I love it. It is PCI-e 4x (instead of 1x like a lot of the cheaper SATA cards): Amazon.com: Ableconn PEX-SA156 6-Port SATA 6G PCI Express x4 Host Adapter Card - AHCI 6Gbps SATA III Port-Multiplier PCIe 3.0 4-Lane Low Profile Controller Card (ASMedia ASM1166): Computers & Accessories
And it supports port multipliers, so pick up six of these and you can hang 30 SATA drives off of this single card! These also support hot-swapping! Amazon.com: PUSOKEI 1 to 5 Sata Port Multiplier for SATA Expander Hard Disk Riser Card 6.0Gbps, for SATA III 1 to 5 Expansion Card for WinXP/Win7/Win8/Win10: Electronics
Here’s my beast running with 20+ SATA hdd’s literally hanging from this card 
Show off your rigs! - Chia Plotting - Chia Forum