the letsencrypt rate limit is daily and per domain. the only time i had problems with it was initially setting up several subdomain certs in 1 day. i just waited a day and did more. then they auto renew every 3 months (if a cron is set).
a lot of cpanel hosts include it now, but i dont have that garbage on any of our servers. we dont even have mysql running.
letsencrypt is a pretty easy setup. install the package, run the command, update the config file, set a cron to update automatically. it took me a day to figure it out and write instructions.
#porncms
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