I ordered this one from Mophie. I think the size and shape should help with alignment. If only Apple’s upcoming mat would be available in Space Gray instead of just white.
I bought the Mophie one that Apple was selling, and it's been working flawlessly for me. That is, it has been charging without any need to realign, etc. The puck is not much wider than the iPhone X itself, so I don't really see how you can put it down and miss the charging coils.
Are you using a thick case or something? (I'm just trying to think of what would cause issues with the charge, though I'm using the Apple Leather Case without issue.)