Docking station for iMac

Hi everyone,

for various reasons I am looking for a docking station with which I can have the possibility to connect more than two devices to the iMac with a usb-c/thunderbolt port. In my case, I have a second screen always connected but I would also like to connect an ssd hard drive and an external gpu, but with one port occupied by the second screen I can't do that. Does anyone use a dock station with the iMac?