I got two of these: https://www.amazon.com/WALI-C-Clamp-Mounting-Workstation-C-CLAMP/dp/B07BHXXR4D/ref=sr_1_2?dchild=1&keywords=WALI+C-Clamp+Base+Stand+Mounting&qid=1584663978&s=electronics&sr=1-2
and just cut and bent two pieces of .063" (1/16) diamond plate I got at Home Depot. Painted flat black.