Uni project research - home bike storage -please help! I gotta do it by Wednesday

I think that a tweak here or there of the pedal hanger would do, for the reasons you mentioned - they stick too far into the room, as there's clearance for very wide flat bars. They should have done a shorter one for drops/narrow bars. As for marks on Walls, a black paint stripe would fix that, cos yeah it's not ideal.

I don't care about marks on the wall. It's my damn wall.
The other problem with them is that they let the bikes tilt, rather than keeping them level.

But they are great otherwise