Sorry, missed this. I use SKK50's Mobile Workshop mod. Cool thing about it is if you set up the workshop in a new location without taking down the previous one all items will remain in the last area automatically. Any powered items automatically stay as well to avoid the power bug. So you can basically do something akin to what the SS2 team did with Concord's walls and defenses. Build out areas you like. Add defenses to places like the DC entrance or Good Neighbor. You can even drop the workshop in Concord as the area builds out with Chapter 2, and build some additional turrets to keep the main street safer if you use mods like NPCs Travel or various spawn point mods that might drop enemies in the middle of the town.
Been messing around the the CAMP mod a bit too lately. Seems to work, but no idea what it will do long term to my save file. Once you place one down that's it though. No going back. Save first.
Edit: Conquest isn't compatible in that I wouldn't go placing SS2 plots down in Conquest settlements. But you could probably still use them to create checkpoints and such, especially around the MM towers. I'd just use non SS2 things in those though. Guard posts, scavenger stations, vanilla farming, etc. Might actually try that out sometime to see just how incompatible the two mods are. Conquest was always a bit buggy, but still cool if used correctly. It's also pointless to place SS2 plots using SKK50's mod or the CAMP mod as neither can be used to send settlers to. Mobile Workshop does show up in the settlement menu when sending settlers places, but I'd never do it due to how he set up that system.