Flexible alarm - Beep 10m to and 20m after the hour

Here is the situation. I teach English online, and I have 30 min long classes, each beginning on and 30m past the hour. I need to check my bookings regularly, and not to forget to do so.

So, is there an alarm app that I can set to beep every 30 mins, at 10m to 20m after the hour, and start and stop with once click? Paid app is fine. This would make my life easier.

Any advice appreciated.

Ian

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Flexible alarm - Beep 10m to and 20m after the hour