Question about Icy Box Ib-Ac6104-B

It depends on what you want to connect. You should be especially careful with external drives, because certain hubs - even with external power supply - are not accepted by the PS4. Unfortunately, I am looking for a compatible USB 3.0 hub that allows multiple external drives. Apparently, the Anker Hub and the one from Sabrant are supposed to work, but you can hardly find both of them in Switzerland.

Already answered on the last question:
I see no reason why not. For the SP4 you can use any USB hub as far as I know.