How about this arrangement:
If all of these categories are correct, then the municipality which would satisfy all 7 categories is:
PS It's also worth noting from the comments that there are a few alternative linguistic categories that would also work to produce the same final connecting municipality...
I believe you were at...
Longest in its kind across the globe
Where five of seven meet the shore
Here the rights are set in stone
To cruise along the world's floor
Shells of wisdom, in a warm basin
Within which lies a land of freemason
Toward evening from the father's waters
With lonely monarchs and the mockers
I am still not sure about the wordplay of number 4 and part of the wordplay of number 10. I am confident, though, that the theme is
It took ages before I could finally solve a Cryptic Family Reunion™ puzzle! Nice tricks overall.