I was looking for precisely this! Thanks!
I also struggled with this for my Subaru Outback, and wanted to create something that was less obtrusive than a 2x4 or a fork mount permanently attached to the cargo area. CycleRest attaches to the rear seat headrest and then when folded down secures the bike upright to better utilize the space. Also this set up is easily transferable between cars, and is designed for travel to use in rental SUVs when traveling for races.