Here is what the RF 28mm f/2.8 STM pancake lens looks like on the R6. This photo has the Minolta lens hood for my MC W.ROKKOR-SI 28mm f/2.5 lens on the RF lens. They both have 55mm filter threads.
On the R6 is a Leofoto L plate for attaching to tripods and monopods in either portrait or landscape orientation. It also keeps the small camera body and lens combinations from falling into the vertical spots in my shoulder bag.