Try using a stainless steel saddle valve.
Run the drain line from your ice maker to the sink cabinet and hook-in before the P trap (between the sink and P trap), that way your ice maker and ice won't smell like sewage. Clean outs are not a good spot for drains, and they aren't before the trap.

Run the drain line from your ice maker to the sink cabinet and hook-in before the P trap (between the sink and P trap), that way your ice maker and ice won't smell like sewage. Clean outs are not a good spot for drains, and they aren't before the trap.