FAQ Schema best practice

Hi all,

I am not a SEO expert but I am doing some work to help a client. The website is for a specialty service company that offer two core services that are reasonably similar - but would have slightly different FAQ questions/answers. The company is in a small country and most of the top ranked search results are from another country or for not relevant services.

My question is - is it best practice to put the FAQ schema on the landing page or on each of the service specific pages even though the question/answers will be almost the same.

For context, it should be very achievable to rank both service pages and the landing page #1 for our target key words with a bit of SEO and time.