Do I need a suction cup or hook to mount it in the shower?

Most picks use a carabiner, loop, or strap rather than a suction cup. A JBL Clip 5 clipped to a shower caddy or a Sony XB100 with its strap on a hook works well in the consensus reports. Suction cups can fail on textured tile, which is a recurring complaint in retailer reviews of the budget shower-specific models.