Fla county held cert. questions

[Roger Gelpey]

I have been looking at a list of county held certificates and noticed that several properties had multiple certs  held by the county. I am curious as to whether there is any advantage to owning multiple years when applying for the deed. Some of the properties are of interest to me even after satisfying the other owner's certs if I buy the county ones (some even though homesteaded). Another question I have is whether I would earn the 18%/yr interest on say a 2015 cert if the deed sells to someone else?

Can someone please outline the risks in buying county held certs (especially multiples)?

Do life estates complicate the purchase/deed process?

Any help would be GREATLY appreciated!