I have sensors around my house too, I do like to have them.
Im using HKC wireless PIR Cams with pet lenses in. I do get the odd false alarm but as i can take a picture via the app i dont worry.
However these are internal devices i fitted them externally to test.
that's the reason they get bought. cheap
Just think your wanting a movement sensor to ignore movement. so called pet sensors are cheaper than doing it right.
Most pros will say perimeter imo
Plastic will need more vibes as it absorbs shock
my advice would be perimeter protection. Plenty of vibration detectors, depending on window /door type.
pet sensors are a bodge designed to save money over having to use perimiter.