Wondering how to secure a small pad in one spot, myself. My "wherever" chin might benefit from a few small pads on top of his liner that I could change out easily and frequently. Then again, it might become more of a pain than a help.
Have you tried to potty train your chin? Try soaking some wood shavings (I use pine litter) in a fresh spot of pee and putting them on top of clean shavings in a dish. Then put the dish in that spot and see if your chin uses it. Mine didn't so I went with a full liner. I try to change it every couple days or so.
Just a note, my chins love their fleece. They both pee on the fleece and not their wood shelves, but they also snuggle and sleep on their fleece as well. A small fleece pad might become your chin's favorite spot to sleep rather than pee.