Can the applicant's representative collect the Delivery Instruction Slips (DIS)?

Yes, the applicant's representative can collect the DIS booklet from the following address:

Zerodha Customer Support Centre,
680, Fortuna 1, 15th Cross Road,
8th Main Road, 2nd Phase, J. P. Nagar,
Bengaluru, Karnataka, 560078

For a fresh DIS booklet, the authorised representative must submit the DIS request form (PDF) and the ID proof, both signed by all the account holder(s). For an additional DIS booklet, the representative must submit Annexure B, which can be found on the last page of the DIS booklet. See How to get a Delivery Instruction Slip (DIS) booklet?