Question about Peak Design PL-S-3 Standard Plate

Yes, as far as the Rollei C6i is concerned. I use it on my Sony A7 with my Rollei C6i. I can't say anything about the Gorillapod. Peak Design says that the Standard Plate works with most ARCASWISS-compatible tripods (which is certainly the case with the Rollei tripod).

I use it for my Peak Design tripod. I have to screw the camera directly onto my Joby tripod, i.e. without a plate.