Bit late to this one.
For ages I used hooks on Arris rail to get them at 45 degrees to the wall. This was for 4 bikes & while it was a good solution, the bikes stuck out too far into the garage & got in the way. They weren’t top & tailed, so there was quite a gap between them.
I took it all down & now have 2 bikes on one of those pronged hangers on the wall, which isn’t great as the wide bars of the mountain bike mean it’s a struggle to get 2 on there.
The other 2 bikes sit below leaning against the wall.
But, I am loving the idea of that sliding rail solution. The ability to squish them all up together is really appealing. I’m gonna have to look at the space I’m using & see if that would be a better solution.