Edit to my last. You may lose some pressure if you decide to tap in downstream of the cold water shut off and that may affect your RO/DI production. Don't know that much about them since I don't own one myself, but have been reading that they need a good amount of water pressure to work properly. So, you may be well advised to tap into the larger line coming through the wall to minimize water pressure loss. So basically, copy what has been done for your dishwasher supply with the RO/DI hookup on the cold water side.
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