No mound, just a few holes in the ground next to a sheet of metal.
Photos 3-5 show pronota of three different individuals.
Enslaved by F. sanguinea: https://www.inaturalist.org/observations/208180427
Individual 1: photos 1-4
Individual 2: photos 5-8
Enslaved by F. sanguinea: https://www.inaturalist.org/observations/208182915