I have the Atera Strada - bought it from roofbox as well.
It is expensive but it's very well made, very easy to fit and very secure. The rack itself when on feels very solid as do the bikes when attached - both can be locked.
I use additional straps for piece of mind when I have 4 bikes on but you don't need them.
Took 4 bikes to the S of France last summer with no problems - very handy to be able to swing it away from the car to get in the boot.
I figured my bikes are worth rather a lot so it's worth getting a very good rack and this is.
In case you missed the subtlety - I'm a big fan and highly recommend.
One thing the sales stuff doesn't mention is that the rack beeps with the indicators - can be irritating but also it's a reminder when you've forgotten to attach the electrics.