This offers multiple ways to mount an inexpensive Hygrometer.
The clip and frame can be glued together in any configuration. This should give you plenty of options on your MK4(s).
If you glue the frame behind the clip bevel, you'll have plenty of clearance from the print head (Make sure you double check that though).
This is the clip that connects to the top of the MK4 frame. The larger part of the clip is the top.
This frame holds the sensor package.
It has two options
This frame is meant to be glued to the Frame Clip so that it can be mounted on the MK4 frame.
These allow you to mount the sensor on a flat surface using double sided tape that is placed on the pads.
It has multiple options
The following is a list of sensors that are known to fit.
Printed with Generic PET-G using the Default Prusa Slicer Settings
The author remixed this model.
I've disconnected the frame and from the clip so that I could just glue them together in whatever configuration I wanted.
I've also slightly modified the shape to make them more robust.