I thought it was about being outside of the actual cemetary area, so unless that outside area is private property, there shouldn't be any problem hanging there. At least here where I live, we have at least 3 cemetaries in the middle of the city, public roads passing by just beside them as well. And that's totally normal for many Finnish cities.Are you serious? Do you realise what the point of cemeterys and churches are?
And do you really think they would put up a sign if it was restricted to outside of the property?
Maybe in US for example, cemetaries are some well hidden places in the middle of nowhere, so I could understand if people don't just accidently go past them.