This almost seems worse to me. Doesn't this imply it sits further from the vehicle and puts more strain on the receiver than one that sits closer? Especially if you add a third bike.
Response to the first question. I have the 1up rack (single + add-on). With no bikes on the rack, the rack can fold up vertically, so it is very tucked in close to the car. But then, then with the add-on on (i.e. for two bikes), it will block the hatch. There is a setting where you can tilt the racks back about 30 degrees, allowing the back hatch to open. That's a nice compromise, you can drive with it in that setting, it sticks out a tad further, but gives access to the back area.
With the bikes on, they will block the back hatch from opening. You can readily pull out the bar and tilt it back 30 degrees, and then there will be clearance to open the back hatch. You can't drive in this setting, but can temporarily tilt the bikes back to get access.
Summary: there are 4 positions for the rack: Straight up (no bikes, blocks hatch with add-on attached), ~30 degrees tilt (no bikes, doesn't block hatch), 90 degrees (so platforms are horizontal, for loading and ferrying bikes, blocks hatch with bikes attached), and 120 degrees (bikes tilted back, for temporarily gaining access to the hatch without unloading the bikes).
I hope this makes sense and helps.