Listen to this guy, he’s smart.Your friend, im sure is trying to help, hasnt a clue. Generally, zillow is close. It's not always accurate.
Rental companies arent going to sell you the propery. They need it for cash flow. If they sold it to you, they have to pay more...on the market...to generate cash flow.
But to answer your question...its a waste of money to inspect a property before there is an offer accepted. There is no point in spending money to look at something that wont be sold to u