LetsEncrypt issued certificates only last for 3 months thats bad... but if you use froxlor as admin interface for your web/mysql accounts then you're able to reissue those certificates automatic by a cron (just as a tip)
Letsencrypt has ssl certificate as it was, but to install the system it is necessary to have root access on the server. As far as I know A2hosting has this system already implemented on the shared server