It's a good point. A friend of my wife bought a Cali and an Atera Strada recently and she also can't install the rack on her own. It is a bit unwieldy to fit and worth trying before you buy if you can. The Atera promo video I remember seeing made it look easy but it is fairly heavy.
I never added the fourth bike attachment as I always threw my daughter's bike in the boot. As shes on a 26" bike now though that will change. I'll try the "free" VW rack I had thrown in to my deal and see how we get on and if not, I'll go back to the Strada as it's a known quantity for me.