Looks like the original used double sided foam sticky tape. Get the 3M brand. Comes in different widths so get the same as original:
Amazon.com
Got to clean off all the old foam.
That's not double sided tape but more of a foam seal.
The two clips on top slip under the metal edge and the bottom just clicks to the latch assem.
RTV will work just get it good and clean don't over do it and let it setup before use but understand how it clips in first.
Thanks for pictures. It is a good warning to spray Fluid film inside rear door.
My detailer guy suggested the 3m wax product to spray in side doors.
I love fluid film also (as you can see). This vehicle was neglected up here in Wisconsin before I got her. Only bad spots are the Passenger front door and this one.
The only bad spots that you know of.