If someone gets put on a plan, their best advice is to do three things
1. financially/family prepare as if you're going to lose your job. Cut spending, pump up savings, etc.
2. job hunt like a mofo, in case the PiP doesn't work
3. (and this is important) - throw yourself into the PiP and do everything you can to lean in and improve. Even if you think it's worthless, unfair, even if you are sure you'll have another job in a week. Lean in and do your damndest to improve. this gives you the chance that you'll keep your existing job longer (perhaps indefinitely) and will give you massively better references in the future (two jobs from now)
3 is the hardest step, but really important