Best way to attach rod holders to outside 2520XL Transom?

Research 2012 - Parker Boats - 2520 XLD Sport Cabin on iboats.com

transom mount rod holders, bulkhead rod holders

2005 PARKER 2820 xl

Installing Fishing Rod Holders on my boat and other stuff too

TACO Marine 4 Rod Transom Mount Rack TACO Marine

The Best Easy Rod Holder Solution For Your Boat. Clamp On Rod Holder.

2005 PARKER 2820 xl

Fishing Rod Holder: Transom Mounting All Angle Nylon Holder with Alumi - Seamax Marine

Rod Holders on your Boat ! 4 Easy Steps to mount and set-up on your Boat or Kayak.

Bait tank install and plumbing