The proper place for a deceased cat should a place it enjoyed in life because cats are almost the definition of knowing where they look their best and they know thos locations.
The proper place for a deceased cat should a place you look at frequently in the normal course of your life, because cats deserve to be remembered.
The proper place for a deceased cat should be a place you will maintain free of weeds and briars and invasive plants so that their final spot will not be lost.
The proper place for a deceased cat should have a decent marker. They deserve it, and making (or buying) one is a final act of love and respect.
The proper place for a deceased cat should include gravegoods in honor of what they most loved in life. Some treats, some Nip, a couple of toys. Add anything you think is good.
The proper place for a deceased cat should include a bit of ceremony. When the last shovelful of Earth's is added and tapped down (gently of course, cat's don't like loud sounds), play a bit of soft music, sit by the spot and contemplate the individuality of that cat.
The cat who shared space with you for a few or many years deserves time for you to recall its habits, likes and dislikes, loves and fears, and how it adjusted to you as you adjusted to it. It was a living, thinking creature.
Cats are still essentially feral animals. Yet they adjust to our world, come to adopt us as we adopt them, accept most of our household rules and get along so gently.
The last thing we do is remember them after they have gone OTB. So do it well...
