Publish multiple tif-files and query region that intersects multiple files

[lukas-paulun]

Hi all,
I was wondering if something like ImageMosaics from Geoserver is already supported in pygeoapi.

My use case:
I have hundreds of tif-files with DEM data, each covering a 1°x1° square.. I would like to publish them such that users can request data for a region of interest, including regions that might intersect with two or more of the source files.
How is that possible? Should I publish each file as an individual collection? But then I don't see how users can request data for regions that intersect multiple files. Or should I publish the folder with the files as a stac-collection? But again, I could not find any documentation on endpoints that can be used to access the whole stac-collection and not only individual files within it.

Thanks in advance for any help!