Regarding the 30 seconds phone squake.
Check this and update be fore going live.
You can change the notification sound to a custom sound since you own an android phone.
Check this article:
https://osigodirect.kb.help/how-to-turn-on-alarm-notifications-for-gen-2-android-phones/
Especially these sections:
SECOND - ENABLE NOTIFICATIONS FROM PHONE SETTINGS
and especially this section to change the sound for each category:
HOW TO CHANGE THE NOTIFICATION SOUND ON YOUR PHONE.
Try the Longbell or the Shortbell category.
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If you do not see the notification categories, check this article out as you will need to enabled them.