You'd be surprised, how many Chinese deities fall under the sintua/folk religion category. Many people who identify as Buddhists or Taoists are actually sintua practitioners; they just don't know it.

If you related some of the deities that your family believes in, I might be able to tell you if you are actually one of my brothers/sisters in faith.
This is a good question.

Heavenly gods and Hell deities are normally placed separately. Take a look at the photo here, for instance; the Heavenly gods occupy the upper portion of the altar, while the Hell deities are placed in an alcove beneath. It is actually quite common for Hell deities to be placed near to or even on the floor; the Chinese phrase for Hell (地狱) literally means 'subterranean prison' or 'prison of the earth', after all.