While testing, I placed two square tile objects next to each other. The Refinery I set as GMS and the Radar factory I set as BRR.
When running Check terrain, it reported two C02BRR00x objects touching each other INSTEAD of a GMS and a BRR.
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I discovered this because I was testing to confirm I could place multiple square tile objects next to each other for the avachanl update. I can work around the problem but it certainly won't be as elegant. There were around 7,000 buildings and objects in Paris alone and many of those objects were, and should remain bombable. In avachanl, Paris represents any target city on the Continent, not just Paris. Yeah, I know, the Eiffel tower sort of kills the immersion.
Then there's London and around a dozen minor cities installed in the AH2 version of the terrain.
Key for me is the ability to install all this without exceeding the maximum numbers of clutter buildings and bombable targets that might reduce what can be added to a terrain.