Hi @Stephen Shelton,
I know there is a lot of debate on this topic, but I think that as you acquire more properties (or assets in general) it is important to have an LLC. Insurance will do most of the job for you, but the insurance companies will always try to find a reason to say that an incident was not covered under the policy.
For federal tax purposes, single-member (single-owner) LLCs are disregarded entities. That means that they would not file their own federal tax return; the activity would continue to be reported on the LLC owner's tax return (in this case on your individual tax return). Florida also does not require a state tax filing for single-member LLCs. However, according to the Florida Department of State webstie, it does require each LLC to pay a $125 initial filing fee, plus an additional $138.75 annual fee (as part of the annual report you would have to file).
Therefore, I would recommend not creating more LLCs than necessary. It may be beneficial to create more than 1 LLC, but I would make sure that your reason for doing so is thought out in advance.
Each house would not needs its own bank account, etc. However, each LLC would.
"Professional landlord" is not a tax term, so I am not positive about what your CPA meant by that.