Record the wall envelope
Measure width at floor, middle, and top; garage walls and floors are not always square. Mark outlets, switches, windows, doors, pipes, meters, and any required service access.
Find the usable depth
Park normally, open every relevant door, and measure the narrowest passage. Subtract a comfortable handling margin rather than choosing a shelf that fills the entire gap.
Measure the storage, too
Record exterior bin width, depth, and height including lid projections. Plan shelf spacing around the loaded containers and leave hand room above them.
Your next step
Use these guides to compare the system types and plan the next zone without losing sight of access, clearance, and installation requirements.