I'll be interested to see what others say, but I don't even bother adding local schema. I haven't found that it does anything to warrent the time being spent. It doesn't improve ranking and it doesn't seem to change anything visually in the SERP that would help with CTR.
We usually add the local schema to the contact page or home page only. I've seen others add it to the footer of their sites and have it present on every page on their site, but I seem to remember a video from Gary Illyes saying that it really only needs to be on the one page, not the entire site. I can't find the video
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