Each of the ten assistants has its own independent individual subscription price. A country's full bundle combines its tax assistant with its accounting assistant (you choose which accounting version you want when subscribing: private sector under IFRS, or public sector under IPSAS) at a total price lower than buying both separately.
Every subscription (individual or bundle) has two billing cycles: monthly, or yearly at roughly a 10% discount versus the monthly price repeated twelve times. You can switch between cycles from the main pricing page when subscribing, or at manual renewal later.
You can combine more than one subscription or bundle at the same time if your work spans more than one country or sector — each subscription is completely independent, with its own billing and its own monthly allowance.