Have installed over 50 of these Dell Optiplex MFF computers.  Clients are always amazed at the size, when replacing their old Tower PC's  It's possible to upgrade memory and NVMe SSD Drives or just add a 2.5" SSD Drive to increase storage.  System supports dual monitors too!  System runs quiet and cool.  Hope the newer models will soon include USB-C.  There's an optional third-party mount that allows you to mount the computer to the back VESA mount on a monitor.Only issue i've encountered is with the power bricks degrading and you get a warning on boot up that the PS Wattage can't be detected.  You can override the warning, and call Dell for a replacement power supply.