Answer: Yes 1. I have Intel i5-10500T, Intel® UHD Graphics 630 that has Max Resofution of 4096x2304[NAME] that points to the direction of HBR2. So always the last thing to check are both monitors MST menu settings. And when both are turned on, it works as advertised.  2. skip, as no USB-C and no place for add-on card without being Dr. Frankenstain. 
Would be nice to have more than 2 Dell monitors. I made a try with no luck.   1. Does MFF have MTP to make this possible to chain two U2422H? 2. Would it be possible to use WD19S hub on OptiPlex as an gateway to second ethernet and more DP ports.   Thanks in advance for all input.
Does Optiplex 3090 MFF have MST?