it's not just the switch, there are inconsistencies in the peg hole sizes of pcbs. GON nerd60 pcbs tend to have larger peg holes than FaceW for example. I've also noticed that newer cherry switches and zealios tend to have thicker pegs than vintage cherry switches. one of my builds mixed vintage pcb mount cherry switches with nerd 60 pcb and the side pegs were too skinny to even hold the switches in place and definitely failed to keep switches in alignment without a plate
This worked great for me on Leeku1800, b.face, JD45, OLKB, oddforge PCBs so far. Still have some GON60 PCB waiting to be built from last LeandreN round so I don't have any experience with them yet.
If PCB mount switches fall out of your PCB you might want to report that to the designer/manufacturer. Maybe it's become too unpopular to do PCB mount builds for PCB designers to care but for stabilized keys and multi-layout plates they have become very important to me.
I mean if there's going to be ANY plate with ISO support I am fine. Dropping it now in a majority vote would be a major kick in my face though, that's what I was worried about. See comments above more as a "Use PCB mount switches for any cutout >1u" statement than an ISO vs. ANSI plate argument.