Q: How many computers are allowed to be authorized on a family sharing plan?

How many computer authorizations are allowed on a family sharing plan? I.e., I see that there are 5 computers authorized on my account when I look at my account information. Are four of those five computers from people that are also on the family sharing plan?

In other words, is it 5 total computers allowed to be authorized on a family sharing plan or should it be 30 (5 computers * 6 people in my family sharing plan)?

Thanks!