Looks as if your 2023 Ranger will be our new 2024 Ranger.
For other members in North America, a hardtop canopy in Britain is what we call a camper shell.
Typically here in the US owners buy the shell separately from a vendor, and installation is either by the vendor or the owner. In years past this usually meant drilling holes in the top of the bed sides to install anchors.
Two big names for canopies/shells here in the US are Leer and Leonard, and other members undoubtedly know of others. Don't know whether those names are sold there. The ones in the site you linked look interesting.
Here are a few thoughts about a choice, if you are able to look at examples in person and ask installers:
1. Fiberglass is probably preferable to aluminum or other metal. But you still want something that is not flimsy or prone to flex.
2. The unit should ideally attach to the bed without drilling holes in the bed sides.
3. The unit should have weatherproofing between the bed sides and itself, not just to keep out all that British rain

, but also to protect the truck finish and minimize squeaks and noise.
4. Consider the number and size of windows, and balance visibility when reversing with security for contents in the bed.
Some of those canopies/shells in the link look really nice on the Ranger. Simply balance cost with your exact requirements, keeping the above in mind.
Also, is the Ranger for personal use or for business? The exact style you need might depend on the use. Over there the odds are you're buying for business, while here most pickups are bought for personal use.
This really isn't that much help, Mart123blue, but I hope it does help a little.