Snapping of non-resizable windows

Hi! I'm currently trying to replace as many tools as possible with BTT. Currently I'm using rectangle for window snapping and the only reason i'm not switching to BTT is the behavior of "maximize" on non-resizable windows (for example, System Preferences).
If the window is non-resizable and you try to maximize it, it ends up in top-left corner. In other tools that i used (Rectangle, and Spectacle before that), the window would just be centered. Is there a way to configure the same behavior with BTT? I tried to play around with the custom snap config, but found no success.

Thank you!