The bible seems to point to congregationalism as the model for polity.
First, the word ekklēsia was a very dominant term in the description of local churches in the New Testament. This points to the fact there was no top down organization that the church had to report to. The New Testament churches were interdependent and when addressed they were addressed as a whole body not particularly one person. In Matthew 18:15-17 dismissing a member was a church made by the whole body and not just the pastor. Which is characteristic of Congregationalist government. 2 Corinthians 2:6 spoke to the whole church on the issue of church discipline for one of the members. Acts 6 when deacons were chosen, Acts 15 the church commissioned Paul and Barnabas both of these examples point to Congregationalist government. I think the trinity can be used to support what the church should look like. The Father, Son and Holy Spirit all work together and agree to govern the body of believers. Each submits to one another and does not do anything without the other
knowing.