What is the geomantic omen in the toilet next to the shop?

That depends on where the toilet next door is. Your shop is just too extreme, and then you can see where the toilet is. If it's in your west, it's better, because the white tiger is not afraid of smelly here. If it is in the East and the Green Dragon, it will be bad. If it's okay in the north, at least water and water coexist, but not in the south.