Arch Linux Question (or any OS that uses systemd to manage processes and follows the [Filesystem Hierarchy Standard by the Linux Foundation][1])

I recently asked where to but a systemd unit file: 
http://unix.stackexchange.com/q/224992/33386

I would like to run a **python script** every 5 minutes (not to be confused with a systemd unit file script that calls the python script). I read the answers to this question:
http://unix.stackexchange.com/questions/198444/run-script-every-30-min-with-systemd

This is where my question comes in. Where should or could you store scripts that are run by systemd? Is there a reserved place for these, particularly on Arch Linux?

 - For example, logs are placed in `/var/log`
 - `systemd` unit files are placed under `/etc/systemd/system`


 [1]: http://refspecs.linuxfoundation.org/FHS_3.0/fhs/index.html