Well, first of all, let me share with you my personal
understanding about what I learnt about Di zhang wang pusa so
far.
I'm not sure if you have read the entire Di zhang wang pusa's
Original Vows sutra yet. But if you haven't, please do. Lots of
questions about ghosts and installation of Di zang wang
pusa's statue at home are answered in it. And if at any time you
don't understand, feel free to ask in the forum.
Before I share my views, I would like you to ask yourself a few
questions:
1) What are the two main qualities shared by all Bodhisattvas
(like Di zhang wang pusa) and Buddhas?
2) Why am I learning about Buddhism and what purpose do it serve
for me by installling a Di zi wang pusa statue for praying at
home?
Is it merely to pray for good fortune, good health for myself
and/or my family?
The di zang wang sutra emphasised this important point: Anyone
who bows, put his hands together with utmost respect when praying
to the Bodhisattva's staue, or recite the bodhisattva's name
wholeheartedly..etc, , all spiritual beings who pass by the house
of that devotee would accord the devotee and his/her family the
same respect as what they would for the Bodhisattva.
That devotee and his/her family would be protected from the
disturbance of evil spirits by these spiritual beings who has
profound respect and devotion to the great wisdom and compassion of
the Bodhisattva.
By having the Bodhisattva's statue in your house and praying to
it wholeheartedly, and constantly keeping in mind the Bodhisattva's
great compassionate vows to save all beings who have fallen in the
3 evil realms or those who have not yet gain total deliverance from
endless cycles of rebirth, any 'ghost' that comes to your house
will not harm you or your family.
If any ghost does want to be chao du, it is a good thing
actually for them to learn of the Bodhisattva's name and his form
through you, a devotee of the Bodhisattva.
Remember praying to Bodhisattva's statue is actually to remind
ourselves constantly about the boundless and great wisdom and
compassion of Bodhisattvas, and to learn to be compassionate in our
daily thoughts and actions towards all beings, ghosts included.
If ghosts could be chao du by you praying to Di zang wang pusa,
do you realise you are actually practising compassion? This
is what true Buddhists would really consider as "praying to and
honouring Di zang wang pusa".
Hope the above can serve as a form of reference for you.
Take care. :)