If you talk to people about homelessness, they will readily admit they just don’t want to see it. If go to any cheaper grocery store you definitely are rubbing shoulders with people who use foodbanks. Food insecurity doesn’t go away just because you have a roof over your head.
The rub is a foodbank in a grocery store will attract the more visible “unreliable access to showers” type of user, which would be unacceptable.
This is a very personal question, and it’s really just whatever you are comfortable with. I personally: