I’ve been using Type 2 attachment points at the rear of my cockpits to tie in the seats, and that has worked really well. I orient the hinge line perpendicular to the packraft’s center line so the attachment point can swing freely forward and back.
I’ve been using the Type 3 attachment points for perimeter grab lines and for attaching my backpack to the packraft, and they work very well. I use a simple fabric loop or D-ring for the rear perimeter lines (as shown in the instructions) and I install female plastic buckles on the four forward ones so I can quickly clip in my backpack (I’ve attached the male buckles to the backpack). For the perimeter lines, it’s best to orient the loops so they swing horizontally, parallel to the lines, otherwise the force gets concentrated on one side of the loop and eventually there’s some visible separation between the fabric and TPU in the loop (I haven’t seen one fail though).
(This page shows the Type 1-4 attachment points I’m referring to: https://www.diypackraft.com/construction/how-to/making-tie-downs/ )