12 CPCs here too. Here's a snapshot of what ours looks like.
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The first line is an OS and every line not shaded yellow is a CPC. Disregard the yellow shaded lines...when this was published it looked like the trainees would be recalled.
For us, there's only a handful of times Management and NATCA have agreed that there can be 1 person in the facility. It's either been after the mid goes home until the 6 shift shows or from when the 13 goes home and the 15 is alone until the mid. We're currently not doing the 16-00 mid at the end of each PP. Instead, they're just giving out excused absence. There's only been a few times where the 6 goes home between 1415-1430 and there's a slight 15-30 gap till the 15 shows up. It was agreed that could happen but only ween collaboratively scheduled.
This, of course, curtails to our traffic...which is pretty non-existent outside of our morning and early evening cargo pushes.