> consider buying 4 USB-C expansion cards, or at least a mix of 4 USB-A or USB-C cards, as they use less power than other cards and you do want to fill those expansion slots otherwise they snag around and feel insecure

The connectors for the expansion cards are all USB-C too, so if it's beneficial to have connection further in instead of right at the edge, you could go without an expansion card for a slot at all.