I have a 49" ultrawide and super hard to get MacBook to work properly.
https://www.cablematters.com/pc-1278-154-vesa-certified-disp...
plus this adapter:
https://www.cablematters.com/pc-1038-122-usb-c-to-displaypor...
I'm using these 2 items to get 4K @ 120Hz on my Acer screen, from my intel macbook.
I have a 49" ultrawide and super hard to get MacBook to work properly.