So, my Display Port to HDMI cables came in last night which I was going to return based on the above, but though why not just check and see.... I now have 5 displays running 1080p!! I have two monitors connected through a splitter to a single USB-C outlet on the laptop and I have the 2 new screens running from the display ports on the UD22. Would this be because the USB-C to HDMI isn't going through Iris?? In any case - [SOLVED]
I work from home fairly permanently now and have decided that I would like 4 external displays (so 4 including the monitor). The monitors I have are fairly cheap and all have HDMI inputs, I work in banking so don't need anything high end from a resolution perspective, just lots of active real estate. Prior to purchasing  my UD22 and the two new monitors I checked in with Dell sales to determine if this would be possible and the response was yes. up until now, I have been running the power in through the Thunderbolt 4 (USB Type-C) port with Power Delivery (Primary)  and a HDMI splitter out through the other Type-C. I am awaiting two new DisplayPort to HDMI cables to arrive, but I have tried to use one of my new external monitors out of the HDMI port on the UD22 (3 external displays) but I cannot get a connection without sacrificing one of the other monitors. Steps taken: Unfortunately I cannot get the third display to show, and am even more nervous that I won't be able to get forth one to show either (once I get the cables tonight from Amazon). Is anyone able to offer any advice? There is not a lot of reading material on this topic and the few bits that I have found I have attempted to emulate with no luck. I do hope I don't have to send everything back     
XPS 13 9305 and UD22 - looking for 4 external displays