How to work with Plan and Pricing of app before submitting to monday Marketplace?

I am confused between 

Which pricing plan an automation app should have ?
1) Seat Based
2) Feature Based

Do I need to handle different scenarios before submitting app to monday Marketplace ?
Or monday natively provides any options to work on the upgrade and downgrade of the plan 

I am having following questions while working with the plan and pricing ( If I am supposing the Feature based plan and pricing ) :

1. On upgrade: what should happen to the automation count limit immediately?
2. On upgrade: what should happen to existing automations that were within the old (lower) limit?
3. On upgrade: what should happen to the monthly action count already consumed?
4. On downgrade: what should happen to the automation count limit immediately?
5. On downgrade: what should happen to existing automations that now exceed the new (lower) limit?
6. On downgrade: what should happen to the monthly action count already consumed?
7. Should the automation count and action count be linked — i.e. does creating more automations reduce your action allowance?
8. Should actions be counted per automation, or as a single shared pool across all automations for the account?
9. What should happen to feature-gated triggers and actions (mirror trigger, formula trigger, move action) when a user downgrades below the plan that allowed them?
10. Should there be a grace period on downgrade before limits are enforced?
11. How to notify the user when they are approaching or have hit a limit ?

I am not having Idea how to implement for the seat based plan & pricing ?