Can I have fixed time slots?

Yes, you can configure slots with any kind of recurrent intervals.
To do this, use the resource type - Event. In the rules of of work, click Configure time. And add the required number of period slots.
If there are a lot of slots, add several periods at once and set the desired recurrence.
As a result, after choosing a day, the client will be shown time slots to choose from.
If the event is multi-day, then the slots will show the time and number of days.
In the resource settings you will find additional settings for slots:
  • List of month events
  • Show rule names under time slots
  • Colorize time slots with rule color
  • Hide end date
  • Show number of shares left
Here is a live demo:
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