My monitor is 49 inch’s big and 25 lb weight(w/o stand). Its stand is also huge and it occupied almost 2/3 of my desk. I was looking for a proper monitor arm because a typical monitor arm cannot support its weight. Finally I found this one and it works perfect. Easy to assemble!
https://www.amazon.com/Ergotron-45-475-026-Polished-Aluminum-Monitors/dp/B01MXYN33U