I don't know if I would worry about it, beyond getting brake fluid flushed every couple of years.
I know I left my car parked 6 to 9 months at a time for about 4 years with no real issues.
near the sea even.
Deployed 9 months out of the first year and about that much every year after that, except dry dock work.
we never bothered to do anything except disconnect batteries and park it in the long term storage lot.
Both in California and Washington state, so pretty extreme on both count, weather wise.
tropical might be an issue for bugs living inside the cars, but rust shouldn't be any more extreme.