How to protect each cell connected in parallel in a Li-ion battery pack
To protect cells in parallel, you put a fuse in series with each cell. This protects the pack from the possibility of one cell failing short circuit, and the other cells then driving a fire-starting current through it.

Now use a single BMS to avoid over/under voltage on the entire parallel assembly.

With a series assembly, the cells can have different voltages, so a BMS channel per cell is required. In a parallel assembly, they all have the same voltage, so all have the same protection voltage requirements.