I installed a Curt rail kit for my 2019 F150 with 6.5 ft bed. Both Reese and Curt make kits with no drilling that utilize existing holes and access areas. Both make 2 versions of the no-drill kit. One has the tabs bending out away from the main frame member and another with the tabs bending inward directly over the frame. Your first link is for the the outward tabs. I installed the kit with the inward tabs and it was much more difficult to torque the bolts fastening the rails to the frame kit due to restricted access. My dealer torqued the 4 bolts I had trouble with at the scheduled maintenance visit. If I were to do it again I would definitely use the outbound kit. The rails are longer than standard for this kit. If I had an installer do the job, I would discuss it with them. I think they typically use universal kits and drill the frame and placement is adjustable.
Good luck, you'll love the 5.0 and the ease of towing.
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George
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