How to map rooftop tennis courts?

There are some tennis courts in my area that are on the roof of a building, and I’m not sure how to map this. Previously the courts were traced but not the building, and when I added the building (traced around the courts) it covered up the courts in the slippy map.

Is it correct to map the building, and the courts as separate areas within it, and tag the courts as location=roof? Are there any tricks to ensuring the courts are visible when this is rendered?

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