Quick question, as someone who has a Maxi, carries multiple bikes a lot, and had used a range of racks and mounts…
Why?
Front wheel off, bars turned towards the wall, wheel next to the front half of the bike with a bit of padding at the rear half is the quickest, easiest, cheapest and most space efficient way of transporting multiple bikes in a caddy, IME.
If you really want a rack, bikestow’s 2 bike rack works well (4 won’t fit), but I find it’s better to have one front wheel in and one back, and the height of the rear door aperture can be a bit annoying when you’ve still got the front wheel in.
They also are more likely, IME, to disrupt view through your rear view mirror, and they use more floor space.
YMMV but I tend to revert to my original method after a bit of use of a rack!