That depends on whether you’re trying to climb hard outside at the moment or not.
If you’re trying to climb hard outside…
Here are some options.
1 Day During the Week
Then consider cutting down the workouts to 1 or 2 per week during the weekdays, and then climb hard outside during the weekend. If you’re just going to do one day of climbing during the week, do one fingerboard/campus board workout and warm up by climbing up to 2 grades below your limit. Do this preferably on Tuesday or Wednesday so you have plenty of time to recover for the weekend.
2 Days During the Week
If you’re going to do 2 days during the week, then do 1 fingerboard/campus board workout and one climbing workout on maybe Tuesday and Wednesday, or Tuesday and Thursday during the week. Do the fingerboard/campus board workout on the first training day during the week so you have plenty of time to recover before the weekend.
3 Days During the Week
If you insist on doing all the workouts during the week, then do one day of climbing on Monday, rest one day and do the fingerboard/campus board workout on Wednesday, and climb again on Thursday. That way you at least have 1 day of rest before the weekend.
If you’re not trying to climb hard outside…
Then schedule the 3 workouts whenever you can fit them in your schedule while making sure you get enough rest. You want to have at least 1 day of rest on either side of your fingerboard/campus board workout, so that’s really the only defining rule. Maybe do a climbing day on Monday, a fingerboard/campus board day on Thursday, and a climbing day on Saturday. Or something along those lines.