I figured out a combination of two mods that changes everything. The first mod is called Basement Living, and it lets you build personal underground homes at settlements. The second mod is called Conquest, by Chesko, which lets you build campsites anywhere.

The campsites can then be upgraded into settlements by building a workbench. Once you have your portable settlement up, you can place one of basement shelters and then dissolve the settlement and campsite, leaving you with a underground player home anywhere you want.

Works amazing. I tested it at Wildwood Cemetery.

They are prefabs of various bunkers you find in the Commonwealth, plus a couple that were cut from the game. https://www.nexusmods.com/fallout4/mods/10967

Neat!

a cemetery underground home.

I believe those are called tombs...

Nuh unh!! You just made that up!

Seriously though, should it still be called a tomb if you live there? Would a mausoleum still be a mausoleum if someone lives out of one? Or should it then be considered a really stoney house? Or do you just go with whatever it’s original purpose was intended for?

Yeah, it really does make for some great possibilities. I'm thinking of throwing down a couple of them with my next character.