I had the same problems with the Husky liners on my 2024. Sent the first ones back, reordered, and the second set was better but not perfect. The right side keeps popping out at one spot about 1/4 inch. They must get trimmed when they come out of the mold.
I installed the same lights on my 2024 Lariat and found it in the center of the back seat after calling the company. You don't have to remove the back seat; just stretch your arm from this location and feel for it.