OK, thanks guys.
Edited my earlier reply as I should have pointed made it clear that I was interested in extra USB-C connectors instead of USB connectors in general, but hopefully the USB-C's on the B650 PLUS should be enough, particularly if I get an external hub if necessary in future.
Ok, thanks for the feedback, @FerrariVie and @sck451 .
I selected the X670E-PLUS as I wanted potentially more than 1 or two USB-C connectors and was thinking about future proofing the motherboard more than anything else, particularly with the PCIe 5.0 feature.
Will take on board comments about...