I also have an Atera Strada (3 bike model, with additional tray for 4th bike).
Sometimes a bit fiddily to fit the support arms to the top tubes, but it’s a great quality rack. Really stable, and holds the bikes securely. Easy to fit onto car, but does weight ~15kg.
In the past I’ve had Atera roof bars and a Hollywood tailgate (strap-on) rack. The tow ball mounted rack is the most convenient to use so far, and I have no plans to change that.
Only downside is the cost – v. expensive – but you get what you pay for.
For anyone thinking about a tow ball mounted rack remember to check the permitted nose weight of your car. It has to be greater than the combined weight of the rack and bikes you’re going to carry.