I have a city in my game that falls between two landscape proxies. Should I make it fall into one?

My level uses world partition and HLODs.

The most complex asset of my game is a city (and all the NPCs in it). The meshes, materials and logic of the city will make it a huge performance problem and I will probably have to optimize a lot.

The city is a real world location and therefore I cannot change its position. It currently sits on top of two landscape proxies, half on one half on the other. I believe that the city could fall within one tile if I cropped the heightmap again.

I could go back to my GIS software and crop the original heightmap again so to try to fit the city in one tile.

Since landscape proxies already load the immidiate tile next to them, I guess this means that my whole city would be loaded either way. I was wondering if it was worth it to have to redo everything, import heightmap, generate terrain, build HLODs again, etc. I still don’t have anything on my level a part form the landscape, so I wouldn’t lose any other progress.