If I have the money, height adjustable motorized desk.  No need for chair. Prefer to work standing up. [URL] System needs to be high end optiplex 7000 series.  The entry 3000 series is not good for business.  More importantly need to have discrete video card that has 3-4 Display port each supporting 4k, such as Quadro P4000.  Monitor needs to be 24-27” wide screen 1440p.
Type of desk, chair, system configuration..
"DS: When working from home, what is your ideal setup?"