If Spectra or FPL wants you to sign anything or you have already, you can refuse or rescind permission. Here are sample landowner letters modeled on ones by Stop the Pipeline against the Constitution Pipeline that would run through New York State. These letters could work just as well against the proposed Sabal Trail pipeline in Georgia, Alabama, and Florida, or the Florida Southeast Connection in south Florida. (I am not a lawyer; please ask an attorney for legal advice.)
You can send a deny or rescind letter to the same address Sabal Trail (or FSC) used in any letters to you. The address in these sample letters was on letters to Lowndes County from Sabal Trail (and in the preliminary filing with FERC by FSC).
If you deny or rescind permission, please also submit that as a comment to FERC.