If clearance with bolt/chain/disc rotor is an issue then can also try
Carrier on inside/frame/bolt-head
Bolt-head on inside /carrier/frame
There isn't a clearance issue, there's quite alot of space. the rack you suggested won't work because it mounts with a plate which perhaps could be filed into shape to fit the derailleur. Study the following photo. The older, thin style, fits the dropout, with a possibility of either needing to slightly enlarge the hole or file some material (0.5mm) off the bottom.