Originally Posted by MZ
it doesn't seem like it would be real effective since the drip pan is not watertight around the drain
That pan's actually gonna do you more harm than good if you do have a leak, 'specially if it's just a small one.
I'd recommend you dispose of the pan, install a Kerdi drain flat on the floor on top of your tiling substrate, install a waterproof membrane attached to the drain, and tile it.
If you can add a little slope around the drain, that might be a plus, but not a really big one.
Might actually be a lot easier to do all that if you use Ditra for your tiling substrate up to about a foot from the drain and then Kerdi/KerdiBand to attach that to the drain.
Or you can just ignore all that and install your emergency drain pan properly this time.
My opinion; worth price charged.