I like these, they attach at top and bottom which means they are very tidy and don’t hang down loosely. They are lightweight, clean, but blackout so do a good job of keeping the light out. Also, they don’t cover much of the windows when pulled back so don’t mess up driving visibility.
You will probably need to hacksaw the rails to size – they send them too large so you have the option.
Don’t use the small screws supplied, get some larger self tapping screws and drill small holes in the van walls to attach. 1 per side is probably enough but I would do at least one more in the middle to be safe.