I don't use clips on the bottom. I just use office clips for the bag to hold it on top of the kettle. The round part of the false bottom is curved. I just drop in that portion just so the bag doesn't touch the very bottom of the kettle directly. The bag kind of floats with liquid, and you pull the bag to empty the grains before you put heat on it again.
The bag should mostly float with just the strike water in it. I do not use heat at all during the mash, but I only do single infusion.