After considering the various options available, I made five docking stations for free from wood I had lying around.
Each docking station consists of the following pieces:
two 3 1/2" x 3/4" x 8" boards
one 1 3/4" x 3/4" x 8" furring strip
one 3/8" x 4" dowel
eight 1 1/2" wood screws
1/2" holes for the dowel were drilled after the frame was glued and screwed together. Hole measurement location was adjusted to fit different wheel/tire sizes prior to drilling.
The stations hold each bike vertically against the wall, while the bike's weight is actually resting on the rear wheel on the floor.
Each station was screwed to the wall, either into the studs, where they lined-up, or with toggle bolts. Their relative height on the wall slightly varies depending on each bike's wheelbase. Alternating the bikes hanging by front and back wheels would have allowed mounting the stations closer together, but that wasn't an issue with me.
Bikes are locked-in / removed by simply sliding the dowel in and out.