I just bought and installed the 82L Roam "Go-Box" and small cooler using tie downs I found on the internet on my 2023 Can Am Defender Cab Limited. It was pretty easy to do. My box has spare parts, first aid kit, tools...you get it.
Those Roam boxes look nice! I also like the Milwaukee Packout storage system for its ease of mounting and box removal. The Milwaukee Red doesn't match as nicely as your Roam boxes though.