To the question concerning the dish. The extra size of the dish is worth every penny of the additional cost. Definitely get the 36" dish. There are approximately 53
Spanish language channels that you should be able to receive from Florida with the M1 system. I know one of the Univision channels on G10R just got switched to an English RTN channel but you should still be in the 50-60 range. In Florida you should also be able to receive the channels listed as Latin American beam. If you want more you will have to go to a big dish (8.5' or better) and
C band. I do not have a current count of all the Spanish language channels out there available FTA in the US but I know I have 2 fav lists devoted to Spanish language channels and one holds 200 before saying it is full.
Other than that you should be fine with the M1 system. As to your mount. What is most important is making sure the mast is plumb and secure. If you preference for mount matches these 2 items you should be just fine.