Featuring an aluminum frame with small built-in magnets, the 665nm Infrared Magnetic Clip-In Filter for Canon RF from Kolari Vision secures magnetically to the camera mount, and your lens then mounts on top. The filter sits securely between the camera and lens. It's compatible with the Canon EOS R, R5, R6, and RP. Specifically for the Canon RP camera, a mag mount accessory is included. The Canon RP doesn't have the steel elements necessary to support magnetic attachment of this filter. The mag mount has adhesive strips that provide a solution.
This 665nm version requires a full spectrum modification to be made to your camera in order to function properly. This entails manually removing the camera's low-pass filter and replacing it with a clear filter. Once that's done, this 665nm filter will work as intended to block visible light up to 665nm from the light spectrum. (Kolari Vision can make the modification for you at a cost if you send in your camera to them.)
The filter material of the clip-in filter is glass. A small removal tool is included but not required. The compact tool looks like a guitar pick and is included just in case, as the filter can easily be removed by hand.