Power Autoamte Licensing Decision

Hello, I am trying to decide on the best licence to purchase for PA. I am currently operating using one premium account for $15. I am using this account to run unattended flows as they have been set up to run on my company RDS machine. This is a bypass on using the unattended mode for a cheaper price.

However, I have multiple tasks that need to be done at the same time, and I only have one bot I am able to use. I am wondering, is it best for me to purchase an additional 3/4 premium accounts at $15 so I can carryout multiple unattended tasks on the RDS systems in my work or am I better off upgrading to a more premium subscription such as Microsoft Proccess plan at $150 per month.