Address question - regarding posting in the Marketplace

[Karen Orr]

A friend had an aunt die last week.  They are potentially desiring to put the property up for sale on BP.  The other spouse was in the hospital when she died.  And if they live, will head to rehab after hospital. So their question is this, before signing up for BP.  Due to obvious problems with security, people breaking in, knowing the owner is incapacitated, children not living around the corner, is the address required for them to advertise in the Marketplace?  Otherwise, they are looking for another way to advertise once the property goes through probate.  As the surviving spouse, if they make it, may go live with one of their children.  
1) So is address required for advertising in Marketplace?  2) If so, they can't advertise here. 3) So, where can they advertise?  Does Hotpads and others require the address? I believe Zillow requires the address (correct me if I am wrong).  All help appreciated to help this elderly widower.