I have alerts in my google calendar already for 10 and 2 minutes before meetings, but in practice, I'm basically blind to alerts when I'm in meetings or in the zone.
I've asked people to ping me if I'm late, but it feels unprofessional of me, they wait longer than I'd like to reach out, and I sometimes even miss it when they do.
I join meetings as soon as I get out of the previous meeting, and that helps a lot. The failure mode then is if I have volume off and don't notice when the other parties arrive.
I have a
https://g.factoryoutletstore.com/cat/95975/garmin-vivoactive...
and I use alarms and timers all the time as an organizing tool. (Like I always brew tea for the exact right time) Alarms I put in manually rise above the cacophony of computer and smartphone notifications which are 10% relevant at best.
On slack I have everything muted except mentions, meetings, and a couple of channels.