I could have mounted mine on the ROPS, but it functions well and is even easier to remove mounted slightly in front of the ROPS. I also didn't want it to go any higher on the tractor (so it will still fit into the garage).
The ROPS mount has 2 1-inch square receivers mounted to the ROPS and the 1-inch tubes on the top slide in and out quickly. The center top support folds down so the sunshade (sometimes referred to as my "bimini" by my friends!!!) is actually lower than the top of the ROPS. I bought a cheap digital watch and mounted it in the framework and a portable CD player also hangs easily!!! I'll post a pic later- if it ever stops raining!!!!!