I don't think the actual place of death is known - other than the Cape of Good Hope - another example of auto place names. The pages at http://www.reocities.com/Athens/Atlantis/4364/ is very comprehensive - there is a link to a map showing Rensburg farm - suggesting location - but I suggest it is all speculation - unless someone knows better?
Do we have any documents?
What appears on documents.
I am not the expert ,I just know how to google and like you then try to read everything.
Yesterday new discovery - Land van Waveren 1699 then 1743 Roodezandkerk .
Riebeeck-Kasteel 2 February 1661
Also gorgeous map circa 1710 for Land van Waveren and Drakenstein.
From the map Ceres also appear part of old Land van Waveren