Miine arms on modes as well.. i only use home,night away.. i mimic what i figured out was the best when using smartthings.
Night is set automatically when time is between 12:02 and 3 am, and current mode is home, and 6 of my motion sensors are innactive (all of them) for 10 minutes.
then hsm arms when mode changes to night and i also have a rule when mode changes to night to close both garage doors, and a scene to turn off a bunch of lights. lock all doors,
and alert me via a text.
home mode is set when time is between 5 am and 11 am and mode is currently night and there is motion in a bunch of zones (any of them)
I explicitly exclude motion checking in my bedroom or bathroom zones for these rules. For those i have motion turn on a hue light purple and dim for 3 minutes during night mode when there is motion..
and brighter soft white light when mode is home with motion and we are after sunset.
i also use "is my home secure" app to double check specific doors and locks are close and locked when the mode changes to away or night.
Finally for away i either trigger it myself with the dashboard or my phone or watch, and i also have one auto arm to away when presence sensors in cars sense both cars are out. Each garage door auto closes when it senses the presence sensor in the car is gone for 2 minutes, and they both auto open when the vehicle returns.
also when a door unlocks or a garage door opens i change mode back to home and auto unlock relative locks..
for the alerts i have various hue lights light up different colors (red for intrusion, blue for water leak,,orange for fire, etc.) I typically only enable the siren when a house is empty for an extended time.
make sure to put a clear alert button on one of your dashboards. Also, remember to have fire or co or gas alert unlock all your doors.. And for those i do use the siren.
I also dont arm any of the motion sensors when in night becuase people usually walk around, and even exclude some doors (ie slider going to hot tub late at night, or letting dogs out a door etc. These all are armed in away mode.
i hope this helps