Prefered Way to add Custom Rules in Spamassassin

Hello,

i want to add the "Heinlein RuleSet" fpr Spammassassin.
https://www.heinlein-support.de/blog/news/aktuelle-spamassassin-regeln-von-heinlein-support/

is this the prefered Way to do this?
and add this Code to the Daily Cronjob from Spamassissin.

Thanks for the Advice!