These look great, but I feel are impractical for the bike user. For one thing it would not support 2 bikes in a separated manner. I dont like my bike interfering or being interfered with another persons bike. Additionally depending how you lock your bike, (I for one use a U-lock around front wheel+frame) one may find it difficult to lock up and/or keep the bike from falling over.
Therefore as part of the design process various use cases need to be considered and various feedback from cyclists would benefit the design.